Peer means on an equal footing. In data communication
, a peer is a device with communication properties that is equal to other devices. One speaks of peer layers 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 InternetServiceProviders (ISP) about the exchange of traffic and peercasting is about transmitting multiple streams of data for audio and video to different peers.