Personal computer is not a computer network. It is a multi-purpose computer whose size, capabilities, and price make it feasible for individual use.
Example:- Laptop, notebook.
Local area network is a computer network that interconnects computers with a limited area such as residence, school, building.
Wide area network is a computer network that extends over a large geographical distance.
Metropolitan area network is a computer network that interconnects user with computer resources in a geographical area or region larger than that even a large local area network.