FTPQUOTA is the extension given to files that are used by the FTP server called ProFTPD (Professional FTP Daemon). FTPQUOTA files are used to store configuration information regarding user permissions on an FTP server. They may refer to the size of the transfer or the number of transfers. FTPQUOTA is a plain text file created for each user when their account is created.

FTP (File Transfer Protocol) is a server service that allows you to transfer files over the network.