A Network is a group of computers linked together.
In the context of cryptocurrencies, a network refers to the interconnected group of computers, or nodes, that make up a blockchain. Each node in the network holds a copy of the blockchain ledger and follows the protocol for validating and recording transactions. Networks can be either centralized, where a single entity controls the majority of the nodes, or decentralized, where control is distributed among many nodes.
The Bitcoin network consists of thousands of nodes distributed around the world that work together to validate transactions and add new blocks to the blockchain.