1. Computer Network is a grup of computers which are commented which each other to share information and resources. 2. The three types of computer networks - LAN,MAN and WAN. 3. A computer network which is dedicated to share information and resources among several personal computers is known as Local Area Network(LAN). 4. Computer network usually spread acrooss a campus or a city is known as Metropolitan Area Network(MAN) 5. Wide Area Network (WAN) is type of network which covers a wide geographic area like state or contry.