There are lots of various types of computer systems which can be categorised into 3 classes:
Devices include workstations, personal computers, and network computing devices. A workstation or desktop personal computer does not have many resource restrictions when connected to a fixed network. Such as a gaming PC or a laptop.
Multi-functional devices that are easily portable. Such as a mobile phone or e-watch.
A computing system that processes client requests made over a network. A server is defined as a powerful machine designed to compute, store, and manage data, devices, and systems over a network. Servers do not have direct input or a graphical display and are designed to be controlled and monitored over the network.