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FTP is the backbone of file transfers on the Internet, but unlike HTTP, it provides a means of allowing clients to upload files as well as download them, and is considerably easier to set up and maintain.
Most businesses that have a need to transfer files maintain an FTP server, and most Web Hosting businesses use FTP to allow their clients to upload the web pages to their servers.
One good way to picture an FTP site is as a section of files and directories on your computer that you choose to publish like a web page, so that anyone with the correct username and password can access the directories and transfer files to and from them. In fact, with the Windows XP FTP client, accessing an FTP server is done through explorer, so the contents of the server appears like just another folder on your system.
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