L3 cache, or Level 3 cache, is a type of memory cache that sits between the main memory and the CPU cores, designed to improve processing speed and efficiency. It is larger than L1 and L2 caches but slower, serving as a shared resource for multiple CPU cores to reduce data access times and prevent bottlenecks in data processing. L3 cache plays a crucial role in memory hierarchies, where effective cache coherence ensures that data remains consistent across different cache levels.
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