How In-Memory Caching Works in Redis

Redis isn’t just a cache anymore. Sure, it still owns the in-memory speed game—with **key expiration**, **data persistence**, and **horizontal scaling** via **replication** and **clustering**. But if you're only using it to stash a few keys, you're missing the point. This thing handles **streams**, **pub/sub**, **geospatial indexing**, and all sorts of **data types** without blinking. It's built for hammer-time workloads and real-time everything. **System shift:** Redis is quietly rewriting how modern apps scale—less bolt-on cache, more core data backbone.