A blockchain is a network. A network is a group or system of connected people or things. The computers or devices on the network, known as nodes, make up a blockchain network. The networks we use today are centralized. The blockchain network has no central authority — it is the very definition of a democratized system. Since it is a shared and immutable ledger, the information in it is open for anyone and everyone to see. Hence, anything that is built on the blockchain is by its very nature transparent and everyone involved is accountable for their actions.