A blockchain node is an open-source, cross-platform runtime that allows developers to create various services. The P2P protocol allows nodes to communicate with each other within the network and transfer information about transactions and new blocks.
Network nodes are responsible for the correctness and reliability of storing the entered data in the distributed ledger. Each node can store a complete copy of the distributed ledger. Thanks to the blockchain nodes, any user can access the data and can view all transactions conducted or stored on the network.