scp is [color=blue ! important][color=blue ! important]securecopy ftp is file transfer protocol.
scp: encrypted, including username/passwd; part of ssh suite, uses port 22; can put a file anywhere you have privelege to. Also SCP uses any port you specify
scp is a tool to [color=blue ! important][color=blue ! important]copy [color=blue ! important]files
to/from remote servers using an SSH channel. Unlike ssh access it only runs a single copy command. Just as ssh it has full access to the [color=blue ! important][color=blue ! important]file [color=blue ! important]system, only limited by the permissions of the login user account.