The memory unit that communicates directly with the CPU is called _____ memory:

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**Solution:**

1. The CPU communicates directly with the **main memory**, also known as primary memory or RAM.

2. Cache memory is a smaller, faster type of volatile memory that provides high-speed data access to the CPU but is not the main memory.

3. Backup memory and auxiliary memory refer to secondary storage devices like hard drives or external storage, which do not communicate directly with the CPU.

4. Therefore, the correct answer is **main memory**.

**Answer:** main

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