Couchbase Server is a distributed NoSQL database designed to scale easily with its single node peer-to-peer architecture. This allows clusters to be scaled up or down to meet demand with minimal configuration, using APIs and CLI tooling if the UI does not fit needs. Scaling can be done by joining an existing cluster or creating a new one, with rebalancing necessary to ensure data is distributed evenly among nodes, maintaining availability during the process. Conversely, scaling down involves removing nodes from the cluster while ensuring the remaining nodes can handle the load, and performing a final rebalance to finalize removal. This allows for efficient management of resources in response to changing demand.