Redis

Redis is an open-source, in-memory data structure store used as a database, cache, message broker, and streaming engine. It supports strings, hashes, lists, sets, sorted sets, and streams with sub-millisecond latency. In AI agent systems, Redis serves multiple roles: caching LLM responses to reduce cost and latency, storing conversation history and agent state, acting as a message broker for Celery task queues, managing rate limiting, and providing pub/sub for real-time event streaming. Redis is a critical infrastructure component in production AI architectures.