Web-based ssh, or Secure Shell, is a way for you to connect to and control a computer from another computer over the internet. People use it to allow computers and servers to communicate in a secure, encrypted way. It works by creating a 'connection' between two computers, and sending data through that connection in a secure way. With web-based ssh, you can securely access the other computer and give it commands, and it can securely show you the results of those commands.