Nodes play a crucial role in ensuring the integrity and transparency of blockchain networks. Full nodes contribute to network security by independently verifying transactions and preventing double-spending. Running a node enhances decentralization, reducing reliance on centralized entities. In Proof of Stake (PoS) and Proof of Work (PoW) systems, nodes facilitate consensus mechanisms to maintain trustless environments. Businesses and individuals running nodes can improve blockchain reliability while gaining incentives in certain networks.