This document summarizes Redis caching and PubSub capabilities. Redis can be used as a cache with two approaches - TTL and volatile objects. Configuration options for caching include maxmemory, maxmemory-policy, and maxmemory-samples. Redis also supports publishing and subscribing to channels. Commands include subscribe, unsubscribe, publish, psubscribe, and punsubscribe. Psubscribe allows glob pattern matching to subscribe to multiple channels. Potential use cases for PubSub include chat applications, notification systems, and message queues.