Filename

The name of a file, excluding root drive and directory path information. Different operating systems may impose different restrictions on filenames, for example, by prohibiting use of certain characters in a filename or imposing a limit on the length of a filename. The filename extension should indicate what type of file it is. However, users often change filename extensions to evade firewall restrictions or for other reasons. Therefore, file types must be identified at a binary level rather than relying o

One name for a file. This name is listed in a "directory", and you can use it in an open to tell the "operating system" exactly which file you want to open, and associate the file with a "filehandle" which will carry the subsequent identity of that file in your program, until you close it.