etcd is an open-source, distributed key-value store that is used for managing and storing configuration data, service discovery, and coordination in distributed systems. It was developed by CoreOS and is now maintained by the Cloud Native Computing Foundation (CNCF). etcd uses the Raft consensus algorithm to ensure consistency between nodes in a cluster. It is widely used as a foundational technology for Kubernetes clusters, but it can also be used as a standalone tool for managing configuration data across multiple machines or applications. etcd provides simple APIs for reading and writing data, as well as features such as watch notifications and TTL-based expiration of keys.
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