Redis is an open-source, in-memory data store that can be used as a database, cache, message broker, and queue system.
Redis architecture includes key-value store, various data structures, pub/sub for real-time communication, persistence options, and high availability features.
Common use cases for Redis include caching, real-time chat with pub/sub, task queues, leaderboards, and session storage.
Redis offers superior speed, optional persistence, rich data types, and is suitable for real-time applications and caching compared to traditional databases.