FTP is not for email. FTP is short for File Transfer Protocol. It is used, as the names indicates, for sending files. eg: this is used to upload files to a website, directly connect to another system and get files of it etc.

Windows has a commandline version. start > run > cmd > ftp > “help” if you want to see the commands.

There are also many ftp applications, a lot of them are freeware.
Total Commander is a file manager (and a lot more) and has FTP build in.
Cerberus is a free FTP server application.