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ftp is a Unix program that copies files between machines using the File Transfer Protocol. On non-mainstream machines like Macs, similar functionality is provided by fetch, etc. To access a remote machine you need to know an ID and password. Many remote machines provide an "anonymous" ftp service where the ID is "ftp" or "anonymous" and the password doesn't matter (but by convention the user's email address is normally used). WWW browsers can be used to get files from anonymous ftp sites.

FTP is a 2-way service - in principle you can copy files to and from your local machine. Also it keeps a connection open between the machines during a session, which contrasts with the way HTTP (WWW) operations work. Neither of these features assist security. The problems that you may encounter are likely to be related to security issues -

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Information provided by Tim Love (tpl)
Last updated: September 2008