Session management (storing user session data) is one of Redis's most common production uses — its speed, TTL support, and shared accessibility across servers make it ideal for sessions in scalable, multi-server applications, solving problems that in-memory or sticky-session approaches don't.
The problem Redis solves
In a MULTI-SERVER app (load-balanced), where do sessions live?
✗ In-process memory (per server) → a user's session is on ONE server; subsequent
requests routed to OTHER servers don't have it (broken sessions)
✗ Sticky sessions (pin a user to one server) → uneven load, breaks on server failure
✓ A SHARED session store (Redis) → ALL servers read/write sessions from one place
→ Redis as a shared, fast session store solves the multi-server session problem.
