A computer is a device that stores, organizes, and displays information, calculates data, and processes commands input by sentient users,
Duotronic Systems
The duotronic computer was invented by Doctor Richard Daystrom in 2243 and became the primary computing platform for all Starfleet vessels for the next eighty years. (TOS: "The Ultimate Computer")
Isolinear Systems
In 2329, Starfleet began to adopt a new system of computing using isolinear optical chips. (TNG: "Relics")
Bioneural Systems
In the 2370s, isolinear computer systems began to be enhanced by the inclusion of bioneural gelpacks. (VGR: "Caretaker")