From HostThyself

FTP stands for File Transfer Protocol, a very common method of copying files between two Internet sites. The FTP protocol has been around long before the world wide web.

FTP is also found used as a adjective. "I will FTP the file to your server." means that I will copy the file to your server using the FTP protocol.

Anonymous FTP is a special case where data can be transmitted and received without a password or log-in.

An FTP server is a computer dedicated to or commonly used just for the transmission of files. Such a site may also host a number of other services.