In blockchain and crypto, Validator nodes are what most people think of as a node. These are nodes that are part of that blockchain’s validator set and are responsible for validating transactions in consensus with the other validator nodes in the validator set.
Full nodes do not conduct consensus. Instead, A full node simply connects to the network, synchronizes ledger state, and observes the status of the network. It can be used by its operator to expose APIs that allow it to query the network and/or submit transactions to the network.