What is Web (Site) Hosting?

It is the physically storage of web-pages and other web-data on a server.

What is FTP?

FTP or File Transfer Protocol, is service for maintaining a web site remotely. Using FTP you can upload or download any web material to or from your web site.

As a hosting client on agccmail.com, can I use FTP for maintaining my web site?

Yes... you can use FTP for your web site management. If you have enough knowledge of web pages and their linking. In agccmail.com we are providing web-based FTP service and you don't have to install any specified software for this purpose.