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Inverse Document Frequency is a term used to help determine the position of a term in a vector space model. IDF = log ( total documents in database / documents containing the term )
- Browse Related Terms: IDF, Multi Dimensional Scaling, Singular Value Decomposition, Term Frequency, Term Vector Database
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A set of hyperlinks attached to areas of an image. This may be defined within a web page, or as an external file.
If the image map is defined as an external file, search engines may have problems indexing your other pages, unless you duplicate the links as conventional text hyperlinks.
If the image map is included within the web page, the search engines should have no problem following the links, although it's good practice to provide text links too, to aid the visually impaired and those accessing the web with graphics switched off or using text only browsers.
- Browse Related Terms: accessibility, cache, cookie, Google cache, HIT, HITS, HTML Source, Image Map, Invisible Web, ISP, Log file, Page View, Referrer, Site Hit, Traffic, Unique Visitor
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The number of times your search ad is served to users by search engines.
- Browse Related Terms: button, Frequency, Impression, Link bait, Links, Repeat Visitor, Session, Unique visitors, User session, Visit
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A hypertext link to a particular page from elsewhere, bringing traffic to that page. Inbound links are counted to produce a measure of the page popularity.
Link pointing to one website from another website. Most search engines allow you to see a sample of links pointing to a document by searching using the link: function. For example, using link:www.seobook.com would show pages linking to the homepage of this site (both internal links and inbound links). Due to canonical URL issues www.site.com and site.com may show different linkage data. Google typically shows a much smaller sample of linkage data than competing engines do, but Google still knows of and counts many of the links that do not show up when you use their link: function.
- Browse Related Terms: Back links, External Link, Google Juice, Hyperlinks, Inbound Link, Inbound links (IBL), Link Bursts, Link Churn, Link Equity, Link Hoarding, Link Popularity, Link spam, Mindshare, PageRank (PR)
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Links that point to your site from sites other than your own. Inbound links are an important asset that will improve your site's PageRank (PR).
- Browse Related Terms: Back links, External Link, Google Juice, Hyperlinks, Inbound Link, Inbound links (IBL), Link Bursts, Link Churn, Link Equity, Link Hoarding, Link Popularity, Link spam, Mindshare, PageRank (PR)
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A search engine's database in which it stores textual content from every web page that its spider visits.
See Directory. Also refers to the database of web pages maintained by a search engine or directory.
The searchable catalog of documents created by search engine software. Also called "catalog." Index is often used as a synonym for search engine. Index is commonly pluralized as "indices." However, Search Engine Watch instead uses the alternative plural form "indexes."
Collection of data used as bank to search through to find a match to a user fed query. The larger search engines have billions of documents in their catalogs. When search engines search they search via reverse indexes by words and return results based on matching relevancy vectors. Stemming and semantic analysis allow search engines to return near matches. Index may also refer to the root of a folder on a web server.
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Designing, categorizing, organizing, and structuring content in a useful and meaningful way. Good information architecture considers both how humans and search spiders access a website. Information architecture suggestions: focus each page on a specific topic use descriptive page titles and meta descriptions which describe the content of the page use clean (few or no variables) descriptive file names and folder names use headings to help break up text and semantically structure a document use breadcrumb navigation to show page relationships use descriptive link anchor text link to related information from within the content area of your web pages improve conversion rates by making it easy for people to take desired actions avoid feeding search engines duplicate or near-duplicate content
- Browse Related Terms: Alt Attribute, Alt tags, comment, Comments Tag, heading, Heading tag, Hidden keywords, Hidden Text, Information Architecture, Keyword prominence, Noframes tag, Optimization, Render, Title, Title tag
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The field of science based on sorting or searching through large data sets to find relevant information.
- Browse Related Terms: Ethical SEO, Google OneBox, Information Retrieval, Inktomi, ISP (Internet Service Provider), Live.com, Looksmart, Niche, Salton, Gerard, USENET, Vertical Search, Zeal
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First introduced in September 1995, Inktomi Corporation from California was a key player in the search engine market where it pioneered online search technologies. It initially provided software to ISPs (Internet Service Providers) but then went onto power other well-known web search tools such as HotBot, Looksmart, MSN, regional search engines and others. It ultimately displaced Alta Vista when Inktomi started using a distributed network technology (instead of operating everything on one machine) that enabled them to index more than 1.3 million documents on the web at that time. Inktomi was the first to launch a paid inclusion service that meant websites would receive regular and frequent re-indexing for a fee. It also invented a proxy cache for ISP web traffic called "Traffic Server". During its short life, Inktomi acquired many businesses including Webspective, Infoseek, eScene Networks and FastForward Networks. Once the Internet bubble had burst in 2000, many of its acquisitions were sold off due to the financial collapse of most of its customer base. Yahoo! purchased Inktomi in 2003 which remains central to its search engine database today.
Search engine which pioneered the paid inclusion business model. Inktomi was bought by Yahoo! at the end of 2002. Internal Navigation (see Navigation)
- Browse Related Terms: Ethical SEO, Google OneBox, Information Retrieval, Inktomi, ISP (Internet Service Provider), Live.com, Looksmart, Niche, Salton, Gerard, USENET, Vertical Search, Zeal
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A synonym for back links. Popularized by Yahoo!
- Browse Related Terms: Amazon.com, AOL, Channels, Channel listings, DMOZ, Dreamweaver, Inlinks, Portal, Yahoo!, Zeal - Volunteer Built Web Directory
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A contract that specifies the details of your search advertising campaign, including placements options, keywords, ad creative, landing page, pricing, geo-targeting, and language options.
- Browse Related Terms: Dayparting, Exclusive Advertising, Insertion Order (I/O), inventory, NewHoo, Reach, Remnant Inventory, ROI - Return On Investment, Run of Site (ROS), Universe
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Link from one page on a site to another page on the same site. It is preferential to use descriptive internal linking to make it easy for search engines to understand what your website is about. Use consistent navigational anchor text for each section of your site, emphasizing other pages within that section. Place links to relevant related pages within the content area of your site to help further show the relationship between pages and improve the usability of your website.
- Browse Related Terms: Anchor text, Bait and Switch, Block Level Analysis, Breadcrumb Navigation, Conceptual Links, Google Bombing, Google Sitelinks, Home Page, Homepage, Internal Link, Internal Links, Link Baiting, Link Building, Link Reputation, Natural Language Processing, SEO, Site Map, Text Link Ads
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An Internal Link is a hypertext link that points to another page within the same website. Internal links can be used as a form of navigation for people, directing them to pages within the website. Links assist with creating good information architecture within the site. Search engines also use internal text links to crawl pages within a website. The way internal links are structured will impact the way in which search engine bots spider and subsequently index pages.
- Browse Related Terms: Anchor text, Bait and Switch, Block Level Analysis, Breadcrumb Navigation, Conceptual Links, Google Bombing, Google Sitelinks, Home Page, Homepage, Internal Link, Internal Links, Link Baiting, Link Building, Link Reputation, Natural Language Processing, SEO, Site Map, Text Link Ads
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Vast worldwide network of computers connected via TCP/IP.
Sometimes called "The Net", the Internet is a publicly accessible worldwide system of computer networks that enable people to send and receive information from other computers. The Internet uses the TCP/IP network protocols to facilitate data transmission. There are three levels of hierarchy including backbone networks, mid-level networks and stub networks. These include commercial (.com or .co), university (.ac or .edu) and other research networks (.org, .net). The origins of the Internet began in 1962 where a government agency called RAND was commissioned by the US Air Force to develop a military research network that could survive a nuclear attack. Packet Switching was invented as a way of sending data. The first email program was created in 1972. The TCP/IP Protocol was developed in 1973 and by 1983 it became the core Internet protocol. The same year of 1983 saw the development of the Domain Name System (DNS) by the University of Wisconsin. The domain name system made it easier for people to access other servers rather than having to remember the corresponding long IP numbers. In 1992 the World Wide Web was released by CERN and the Internet Society was chartered who controls the Internet. The first graphical user interface to the WWW called "Mosaic for X" was released. By 1996, most Internet traffic was carried by independent ISPs. The Internet Society is building a new TCP/IP that will allow billions of addresses rather than the limited supply that we have today.
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Introduced in 1995, Internet Explorer is a web browser produced by Microsoft. It is also known as Explorer, IE, Microsoft Internet Explorer or MSIE. Internet Explorer is the most widely used browser in the world to view information on the World Wide Web (WWW). This browser didnÂt get popular until version 3 was released in 1996 which supported CSS, ActiveX controls, Java applets, inline multimedia and the PICS system for content metadata. Version 8 is currently in development where further improvements will be made to the security of the browser. There will also be more support for CSS 2.1 specifications. Over the years (particularly in the early releases) Internet Explorer has been subject to harsh criticisms including its security architecture and its lack of support of open standards.
Microsoft's web browser. After they beat out Netscape's browser on the marketshare front they failed to innovate on any level for about 5 years, until Firefox forced them to. See also: Download IE Inverted File (see Reverse Index)
- Browse Related Terms: browser, Firefox, Internet Explorer, Microsoft, Mozilla Firefox, MSN Search, Opera, Safari, Sniffer script, streaming media, web browser, XSL
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An ad page that appears for a short period of time before the user-requested page is displayed. Also known as a transition ad, splash page, or Flash page.
- Browse Related Terms: 200, 404, AJAX, Click-down Ad or Click-within Ad, Custom error page, Error page, Fair Use, Flash Page, HTTP 301 Status Code Definition, HTTP 302 Status Code Definition, HTTP 400 Status Code Definition, HTTP 401 Status Code Definition, HTTP 403 Status Code Definition, HTTP 404 Status Code Definition, HTTP 410 Status Code Definition, HTTP 500 Status Code Definition, HTTP 501 Status Code Definition, Interstitial Ad, Open Source, Token
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Advertising space available for purchase on a website. Based on projections, inventory may be specified as number of impressions or as a share of voice. Also known as ad avail.
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a term that refers to the vast amount of information on the web that is not indexed by the search engines. Coined in 1994 by Dr. Jill Ellsworth.
Portions of the web which are not easily accessible to crawlers due to search technology limitations, copyright issues, or information architecture issues.
- Browse Related Terms: accessibility, cache, cookie, Google cache, HIT, HITS, HTML Source, Image Map, Invisible Web, ISP, Log file, Page View, Referrer, Site Hit, Traffic, Unique Visitor
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Internet Protocol Address. Every computer connected to the internet has an IP address. Some websites and servers have unique IP addresses, but most web hosts host multiple websites on a single host. Many SEOs refer to unique C class IP addresses. Every site is hosted on a numerical address like aa.bb.cc.dd. In some cases many sites are hosted on the same IP address. It is believed by many SEOs that if links come from different IP ranges with a different number somewhere in the aa.bb.cc part then the link may count more than links from the same local range and host. IP delivery (see cloaking)
IP Address stands for "Internet Protocol Address" and is sometimes referred to as "IP" or "Internet Address". It is expressed as a four-part series of numbers separated by periods that identifies every sender and receiver of network data. The numbers represent the domain, the network, the subnetwork and the host computer. For example: 127.0.0.10 with each number ranging from 0 through to 255. Each server or device connected to the Internet is assigned a unique permanent (static) or temporary (dynamic) IP address. The IP Address sometimes translates into a specific domain name.
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Similar to agent name delivery, this technique presents different content depending on the IP address of the client. It is very difficult to view pages hidden using this technique, because the real page is only visible if your IP address is the same as (for example) a search engine's spider.
- Browse Related Terms: Agent Name Delivery, Cgi-bin, Cloaking, Hijacking of Websites, IP Delivery, Navigation bar (nav bar), Pull-down list, Robots.txt, Spider trap, Spidering, Stealth Script, Stop character