Bitcoin Node (BN) is a console application that is included as part of libbitcoin-node. It implements a full node on the Bitcoin P2P network.
The Bitcoin network – is a set of computers around the world that checks blocks and transactions using the Bitcoin Core software. Any user can configure the net if he has access to a PC having the necessary power and connection to the Net.
The distribution of these “nodes” (PC connected to the network), and the fact that anyone can raise one of them, making Bitcoin “decentralized.” Even if one node is running, the Bitcoin network lives on.