Redis is an open-source, in-memory data structure server that stores data as key-value pairs and supports various data types including strings, lists, sets, hashes, and JSON documents. Developers use Redis to build fast, real-time applications that require low-latency data access, caching, message queuing, and vector similarity search across distributed systems. It's commonly deployed as a cache layer to reduce database load, a session store, a message broker, or a real-time analytics engine due to its speed and support for multiple data structures and query patterns.

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