Redis

Open-source, in-memory data structure store used as a database, cache, and message broker. It supports various data structures such as strings, hashes, lists, sets, sorted sets, bitmaps, hyperloglogs, geospatial indexes, and streams, and offers features like replication, Lua scripting, LRU eviction, transactions, and on-disk persistence. Redis is primarily used by developers and organizations seeking high-performance, scalable data storage solutions.