A 3D computer system is a technological product that a person can use to do intellectual operations on data in three dimensions of space.
It shares features with a computer that is not 3D: It uses a processor, memory, some graphics processing, a power supply, networking, sound, external ports, power management, a system bus, a circuit board, solder, surface mount components, optionally a battery, and optionally a keyboard.
A 3D computer system uses a 3D display and a 3D control peripheral such as a 3D pen or hand tracking instead of a mouse, trackpad, or touch screen.