✅ Concept:

The Accumulator is a special-purpose register used by the ALU to store intermediate results during arithmetic and logic operations.

✅ Explanation:

• It simplifies CPU design by reducing the number of memory accesses.
• Results of one operation are stored in the accumulator and used in the next.
• Widely used in simple or older CPU architectures.

✅ Final Answer: $\boxed{\text{Accumulator}}$