Caching is described as which of the following?

Caching is described as which of the following?

• A. A high-speed storage layer that stores a subset of data for quick future requests.
• B. A technology that caches DNS lookups.
• C. A technique used to keep copies of frequently accessed data closer to users for faster access.
• D. A method for distributing workloads across servers.

Answer: (C)

Caching is about keeping copies of data that are accessed frequently in a fast-access location so repeated requests can be served quickly. The description that emphasizes keeping those copies closer to users for faster access best captures how caching works in real systems. By placing data near the point of use—whether in a browser, at a CDN edge, or on a nearby server—the system reduces latency and speeds up responses for frequently requested information. This proximity to the user is the practical advantage that makes caching effective across different layers, from memory caches to edge caches. While a high-speed storage layer is indeed part of caching, the key benefit is delivering data quickly by minimizing the distance data must travel. Caching isn’t primarily about DNS specifically or about distributing workloads—those describe related concepts, not the core idea of caching.