Can you explain what a caching mechanism is and how it works?

A caching mechanism is a way of temporarily storing data or computation results in a fast-access storage (cache) so that repeated requests do not require performing heavy operations again. Cache can be located in memory, on disk, or in a distributed system.

How it works:

• On the first request, data is computed or loaded from a slow source (e.g., a database).
• The result is stored in the cache.
• On subsequent requests, the system first checks the cache — if the data is there (cache hit), it returns it quickly, bypassing the main processing.
• If the data is not there (cache miss), the process repeats.

Caching improves performance and reduces system load but requires management of data freshness (e.g., using cache lifetime or invalidation).