How many levels of cache are there in a CPU?

A CPU typically incorporates three levels of cache: L1, L2, and L3. Each level of cache serves a distinct purpose in enhancing the speed and efficiency of data retrieval for the processor.

L1 cache is the smallest and fastest cache, situated closest to the CPU core. It stores the most frequently accessed data to minimize latency when the processor requires immediate information.

L2 cache is larger than L1 but slightly slower, serving as a backup for L1. It can hold more data and helps complement the fast-access capabilities of the L1 cache.

L3 cache, present in some CPU architectures, is even larger and slower than L2. It is shared across multiple cores within the CPU, facilitating communication and data sharing among them, thereby improving overall performance.

While some CPU architectures may include additional caches or levels, the standard configuration is three levels of cache, which is why the answer is correct.