FTP
From Hak5
FTP is short for File Transfer Protocol, a service which runs on port 21. FTP is a web protcol specially designed for uploading and downloading files.
Clients
Although specialized clients are recommended, you can, in mosty case, upload and download files by FTP using your favorite web browsers, such as Mozilla Firefox, Internet Explorer and many others. All you need to do is to specify "ftp://" before your adresse.
Windows
Windows as has a set of FTP functions build in accessible by console.
Linux
- GFTP