Computer

Computers are machines made (or grown in some cases) to do tasks involving information processing, storage, and retrieval. Computers can do calculations, break codes and almost any other logical thing.

One computer can become linked up with other computers to create an information network. (DW: The War Machines)

The thing about computers, however, is that they are "very sophisticated idiots". They do whatever you tell them to at incredible speeds, so if you order it to kill you and then change your mind, it's very hard to stop it from obeying the original order (but it is not impossible). (DW: Robot)

Computers are also used aboard ships, usually referred to as "the ship's computer". Human ships of the 26th century used computers, typing in messages of what they were planning to do. (DW: Earthshock)

Some computers achieved apparent self-awareness, an example of this being the computer Xoanon. (DW: The Face of Evil)