what is the difference between FTP,SFTP client can any one explain me briefly

The difference is that the ftp traffic is clear text while sftp is secured.

commented: that IS brief :) +13

SFTP is FTP over SSH. It uses SSH protocols to upload/download files and browse the remote server. This would also use the SSH port (default 22).

FTPS is secure FTP (usually over TLS but sometimes SSL). The most basic description would be a secure FTP connection. A normal FTP connection, as JorgeM describes, is just an unencrypted connection.