etcd/Documentation/glossary.md

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## Glossary
This document defines the various terms used in etcd documentation, command line and source code.
### Node
Node is an instance of raft state machine.
It has a unique identification, and records other nodes' progress internally when it is the leader.
### Member
Member is an instance of etcd. It hosts a node, and provides service to clients.
### Cluster
Cluster consists of several members.
The node in each member follows raft consensus protocol to replicate logs. Cluster receives proposals from members, commits them and apply to local store.
### Peer
Peer is another member of the same cluster.
### Client
Client is a caller of the cluster's HTTP API.
### Machine (deprecated)
The alternative of Member in etcd before 2.0