Introduction
Memcached has been the go-to caching solution for years. It's fast, simple, and works. But it's limited – just key-value storage with expiration. No data structures, no persistence, no pub/sub.
Redis is different. It's an in-memory data structure server that supports strings, lists, sets, sorted sets, and hashes. It has persistence, pub/sub, transactions, and Lua scripting. It's incredibly fast and surprisingly versatile.