Where and how is caching used and for what purpose?

Caching is used to improve system performance by storing frequently requested data in fast access memory. This reduces the load on the main storage or computational resources and decreases response time.

Examples of usage:

• Web browsers cache resources (images, scripts) to speed up page loading.
• Servers and databases cache query results to avoid performing heavy operations repeatedly.
• In distributed systems, caching helps reduce network traffic and latency.

Cache can be implemented at different levels: in application memory, on disk, or in specialized systems (Redis, Memcached). It is important to properly configure cache lifetime and update strategies to prevent data from becoming outdated.