File Transfer Protocol (FTP) is a standard protocol for moving files from one computer to another across the Internet. The files are stored on a server computer, which runs FTP server software. Remote computers can then connect using FTP and read files from the server or copy files to the server. An FTP server is similar to an HTTP server (that is, a Web server) in that you can communicate with it using an Internet protocol. However, an FTP server does not run Web pages; it only sends and receives files from remote computers.
You can configure Internet Information Services (IIS) to function as an FTP server. This allows other computers to connect to the server and copy files to and from the server. For example, you might configure IIS to act as an FTP server if you are hosting Web sites on your computer and you want to allow remote users to connect to your computer and copy their files to the server.