A node, in the world of digital currency, is a computer that connects to a cryptocurrencyA cryptocurrency (or crypto currency) is a digital asset des... More network. The node or computer supports the network. It supports it through validation and relaying transactions. At the same time, it also gets a copy of the full blockchainA blockchain—the technology underlying bitcoin and other c... 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.