As the name suggests, the term Consensus means that the participating nodes across a distributed network remain synchronized with each other, while giving their agreement in a self-auditing ecosystem. It is an important aspect of blockchain technology.

The Consensus protocol carries out two different functions:

• It allows the blockchain ecosystem to be updated only if all the nodes in the chain are in sync.
• It restricts any single block to control the whole blockchain.

Consensus protocol has a defined a set of rules that every node needs to follow while validating the transactions. The goal is to gain acceptance for updating a single data value onto the blockchain.