Bait and Switch

The provision of one page for a search engine or directory and a different page for other user agents at the same URL. Various methods can be used, e.g. Agent Name Delivery or IP Delivery.

Marketing technique where you make something look overtly pure or as though it has another purpose to get people to believe in it or vote for it (by linking at it or sharing it with friends), then switch the intent or purpose of the website after you gain authority. It is generally easier to get links to informational websites than commercial sites. Some new sites might gain authority much quicker if they tried looking noncommercial and gaining influence before trying to monetize their market position.

Bait and switch is considered as a spam technique when used in SEO. It provides one page for a search engine or directory and a different page for other user agents at the same URL. Sometimes it creates an optimized page and submits to search engines or directory, but replaces with the regular page as soon as the optimized page has been indexed.