In the world of digital currency, a node is a computer that connects to a cryptocurrencyA cryptocurrency (or crypto currency) is a digital asset des... More network. Nodes support the network through validation and relaying transactions. At the same time, it also gets a copy of the full blockchainA blockchain is a shared digital ledger, or a continually up... More. Nodes that fully enforce all of the rules of a network are called full nodes. Lightweight nodes do not fully enforce all of the rules of the blockchain.