Networking is a group of two or more computers connected together or collection of computers and devices connected together is called Networking. First Computer to Computer link (Network) established on ARPANET (Advanced Research Projects Agency Network) on October 29, 1969. There are three types of Network. LAN (Local Area Network). MAN (Metropolitan Area Network) and WAN (Wide Area Network (WAN) , which is a telecommunications network. Wireless networks are computer networks that are not connected by cables, working like LAN network.