What is Laravel caching best practice for high-traffic systems?

High-traffic caching requires layered caching strategies, proper invalidation, and Redis-based storage.

In high-traffic systems, caching must be designed across multiple layers: database query caching, HTTP response caching, and application-level object caching. Redis is preferred due to in-memory speed and support for TTL, atomic operations, and pub/sub invalidation patterns. A proper cache invalidation strategy is critical; otherwise stale data can corrupt user experience. Common approaches include event-driven invalidation, tag-based caching, and time-based expiration (TTL).