Plesk

FTP Access to Your Websites

One of the most convenient ways to update your website content is to
upload it through FTP. FTP (File Transfer Protocol) is a standard
network protocol that allows transferring files between two hosts (for
example, your computer and a Plesk server). Plesk acts as an FTP server,
while users should use some FTP client to access the directories on the
server. Plesk provides all main FTP features:

Note: Information is transferred over FTP unencrypted. We encourage you to
use the secure FTPS protocol (also known as FTP-SSL/TLS). FTPS is
supported by most modern FTP clients. Refer to your FTP client
documentation for instructions on how to enable FTPS.