When is Illinois' back-to-school tax holiday, and how does it work?

Redis is an in-memory data structure store and a versatile tool for backend engineers, rather than just a simple cache. It effectively solves various problems including rate limiting, queues, sessions, leaderboards, locks, and caching. Typically, Redis operates alongside a primary database such as Postgres. Understanding its nature as a fast store for real data structures allows developers to apply one core idea across multiple use cases to resolve system slowness and improve overall performance.