What are the advantages of using Redis?

Speed: Redis stores data in RAM, ensuring very low latency for read and write operations.
Flexible data structures: Supports various data structures: strings, lists, sets, sorted sets, hashes, bitmaps, hyperloglogs, geospatial indexes, and streams.
Persistence: Can save data to disk using RDB (point-in-time snapshots) and AOF (append-only file) for recovery after restart.
Atomic operations: Supports server-level atomic operations, simplifying the implementation of concurrent operations.
Publish/Subscribe (Pub/Sub): Built-in messaging system for implementing the publisher-subscriber pattern.
Ease of use: Redis protocol is simple, and many programming languages have clients.
Scalability: Supports clustering for horizontal scaling and increased availability.
Use as a cache: Often used as a high-performance cache to speed up access to data from slower storage (e.g., databases).
Use as a message broker: Can serve as a lightweight message broker.
Lua scripts: Allows executing complex atomic operations using the embedded Lua interpreter.

Common use cases: caching, user session management, task queues, counters, rate limiting.