What is ftp?  

FTP is a file transfer protocol. That's just the way you transfer files online that's it.

ftp stands for File Transfer Protocol and it is a program that can be used to transfer webpages and files up on to the Internet. If you have the right software you can prepare webpages off-line and then upload them when you are ready. - Derek

FTP is generally a software and stands for file transfer protocol. It can be use to transfer files from the net to your desktop or from your desktop to the net. Most people which has a blog or websites uses FTP software to transfer their picture files onto the web server.

In most cases you need software to use FTP, but there are some website hosts that use a java-based application right on the server to do the exact same thing. Most websites utlize this fuction to upload material general full web pages to the net. It's simple to use, and streight-forward.

ftp is a space where we can browse our files like a hard disk. we can access this space throigh some softeres like filezila. we can perform all operations that we can perform on our files and folders on any partition

ftp is file transfer protocol.It's commonly used to download programs and other files to your computer from other servers.

Like their is http which is used for transferring webpages and normal file, and SMTP simple mail transfer protocol used for transferring emails.

for more details
http://www.aota.net/FTP/index.php4

as the others said, FTP means File transfer protocol in which you host a protocol on the net in where you can share your files online for others to download.