FTP, or File Transfer Protocol, is a standard network protocol that is used to transfer files over a network. FTP is a client-server protocol, which means that an FTP client application, such as a web browser or a file transfer program, is used to connect to an FTP server and request the transfer of files. FTP allows users to upload and download files, as well as to list, delete, and modify files on the server. FTP is widely used for transferring files over the internet, and is often used by websites, servers, and other networked devices to transfer files between each other. FTP is typically used to transfer large files, or files that need to be transferred securely or reliably, and is often used in conjunction with other protocols, such as SSH or SSL, for added security.