Plain FTP is a type of connection which is easy and convienient to use specially when you are planning to upload your website.
Use the following settings on your FTP client to connect to the server via Plain FTP.
1. Open Filezilla
2. Go to File > Site Manager
3. Enter the following details
***********************************************************************
Host: (shared server or domain)
Port: 21
Protocol: FTP
Encryption: Plain FTP
Logon type: Normal
***********************************************************************
4. Then use your cpanel credentials or your created FTP account inside cpanel.
*Note: You might want to check this also in filezilla to prevent request timouts:
Edit > Preferences > Timeout in seconds (increase it or make it 0 to disable)