FTP stands for File Transfer Protocol. Essentially, it is a simple tool to move files from one computer to another computer.
How would FTP work for me?
Lets assume that you have created a web site and you have seventy-five web pages that you want to display to people. Instead of copying all of the files to disks and manually placing the files on the Web Server, you could open an FTP client, find the Web Server, navigate to the required directory and then upload the files.
Thus, FTP is simply used:
to download a file from a server using the Internet, or
to upload a file to a server (e.g. uploading a web page file to a Server).