Electronic systems are a combination of electronic circuits and components which are designed to accomplish one or more intricate tasks. Examples include telecommunication systems, computer systems, power distribution systems, radar systems, electronic music systems, and the like.
A computer system is a system of interconnected computers that share a central storage system and a variety of secondary devices such as a printers, scanners, or routers. Each computer connected to the system can function independently, but has the ability to communicate with other external devices and computers.
A telecommunications system is any system for communicating at a distance. Telecommunications systems are two way unlike radio broadcasts that are strictly one-way. Telephone systems had to make a physical connection between your telephone and the telephone of the person you wished to communicate with. This meant that there were lots of switches needed and lots of cables; any single phone call would take up two wires (one each way) at a minimum.