What is FTP?

FTP stands for File Transfer Protocol. It is used to transfer data from one computer to another over the Internet, or through a network.

FTP works in the same way as HTTP for transferring Web pages from a server to a user's browser and SMTP for transferring electronic mail across the Internet in that, like these technologies, FTP uses the Internet's TCP/IP protocols to enable data transfer.

FTP is most commonly used to download a file from a server using the Internet or to upload a file to a server (e.g., uploading a Web page file to a server).

To get hang of it, please visit this website:
http://en.wikipedia.org/wiki/File_Transfer_Protocol