Telnet clients are part of the larger category of terminal applications which are designed to allow your PC to emulate another type of computer. These programs allow you to log on to much powerful computers and perform tasks as if you're actually working on the remote computer itself. This is especially helpful for users maintaining an account on a UNIX machine at work or school or for users wishing to log in to publicly accessible remote computers. Terminal apps allow you to access a host computer from anywhere a PC can be found.