PuTTY i.e. a telnet- and ssh-client. We used this to connect our workstations with our servers in the university. The program basically allows you to do many things, where one of them with my example was to link with the database/servers so that I could connect to the server through my Java web-application for database queries.
The webpage where you can download it is here
I will later, when we will start go to the database section in Java, post the rest of the information related to this specific program.