@neerajgarg2604 A node is a Dgraph process (e.g., a Dgraph Zero or Dgraph Alpha).
The minimum Dgraph cluster is a 2-node cluster (1 Zero, 1 Alpha). If you need high-availability, then you’d run a 6-node cluster (3 Zeros, 3 Alphas).
Dgraph is horizontally scalable, so depending on your needs you can run more Dgraph Alphas to scale out.