Peer means on an equal footing. Indata communication, a peer is a device with communication properties that is equal to other devices.
Peer layers are said to exist when corresponding layers of two interconnected nodes communicate with each other. A typical example of such a peer network is a peer-to-peer network. Peering refers to agreements between Internet Service Providers(ISPs) on the exchange of traffic, and peercasting is about transmitting multiple streams of data for audio and video to different peers.