FTP client is a program designed to exchange files between a computer and an FTP server. In the directory you will find various FTP clients, which work with both the relatively old Windows XP and 7, and running modern Windows 8 and 10.
Modern FTP clients, such as CuteFTP and FileZilla, support secure protocols such as FTPS and SFTP, which makes it possible to transfer files more securely. FTP client can support the function of synchronizing folders on the hard disk and on the server, working through a proxy, encrypting data when sending them, and some other useful functions.
By the way, the program for connecting via FTP can be built into another application, for example, in Total Commander.