A high-speed memory is placed between the Central Processing Unit (CPU) and the primary memory known as ______ memory.

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**Solution:**

1. Cache memory is a small-sized, high-speed memory located between the CPU and the main memory (RAM).

2. It stores frequently accessed data and instructions to reduce the time the CPU takes to access data from the slower main memory.

3. Read-only memory (ROM) is non-volatile and stores firmware, not used for high-speed CPU-memory communication.

4. Virtual memory is a technique that uses disk space to simulate additional RAM, not a physical high-speed memory.

5. Secondary memory refers to storage devices like hard drives, which are slower than cache memory.

**Answer:** cache

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