Rlogin and SSH are tools that are recognized and used to remotely access a computer, run programs, as well as some other things. These two tools permit people to easily retrieve their data and manage files too even if they can’t access it locally. The major things that distinguish between Rlogin and SSH are their security features. For Rlogin, all the traffic is sent in plain text, and it does not use encryption; this is simply because security was not really a major problem when Rlogin was created. But as Rlogin started becoming incapable of handling the security system, then SSH had to be unveiled as a more secure alternative.
SSH, unlike Rlogin, makes use of encryption to protect the transmitted or received traffic from snoopers; it avoids sending everything in plain text. Rlogin cannot be used for automation, but SSH can. Also, Rlogin does not authenticate the user, but SSH does.