A Peer Node is a computer or device that participates in a network by sharing resources and information with other nodes. In a peer-to-peer (P2P) network, each peer can act as both a client and a server, allowing for direct communication and data exchange without the need for a central server. This decentralized structure enhances efficiency and resilience. Peer nodes are commonly used in various applications, such as file sharing, blockchain technology, and collaborative platforms. For example, in a blockchain network, each peer node maintains a copy of the entire ledger, ensuring transparency and security in transactions.