FTP is an abbreviation of File Transfer Protocol, the protocol for exchanging files over the Internet. 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).
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