What other caching systems do you know besides Redis?

Besides Redis, there are other popular caching systems:

• Memcached — a simple and fast in-memory cache, often used for caching objects and sessions.
• Ehcache — a cache for Java applications, supporting both in-memory and disk storage.
• Hazelcast — a distributed in-memory cache and computing platform with clustering support.
• Apache Ignite — a distributed cache with data processing and computing capabilities.
• Caffeine — a high-performance local cache for Java supporting various eviction strategies.

The choice depends on requirements for distribution, data volume, access speed, and integration with the application.