Simple definition
A CPU cache is fast memory close to processor cores that stores frequently accessed instructions and data.
Purpose and use
Processor cache reduces access time for selected instructions and data used during execution.
How does it work?
Levels commonly called L1, L2 and L3 interact with cores and main memory according to the architecture.
Example and verification
When comparing workloads, assess cache behavior alongside memory access and core topology.
Points to watch
Greater cache capacity does not guarantee improvement for every application; locality, latency and contention also matter.
In short
Cache size alone does not describe its performance effect.