Peer to Peer (P2P) refers to the decentralized interactions between two or parties more in a highly-interconnected network. Participants of a P2P network deal directly with each other through a single mediation point.
Where it is used? There is no need for a dominant authority for P2P interactions in the blockchain technology.
What’s the use of it? The user becomes the true owner of their personal data, no single party can control and use the network to push its own agenda.