FTP or File Transfer Protocol is pretty much self explanatory. As the name suggests, it is used to transfer files to the internet. It can be used to transfer files between two computer accounts, transfer files between an account and a desktop computer, or access online software archives. It is most commonly used to download a file from a server through the use of internet or to upload files to the server.
How do you use FTP? Easy. You can use a web browser to connect to FTP addresses just like you would to connect to HTTP addresses. Your web browser will take care of some of the details of connecting to a site and transferring files. It is convenient and hassle free. The only downside is web browsers are often slower and less reliable than when you transfer files by graphical clients. To use your web browser to connect to an FTP site, just replace what is normally http with ftp.