Answer:
Central processing unit (CPU).
Explanation:
The cpu is the brain of a computer system. It has a cache memory to hold data to be processed, bus line to run the data to processing unit and various chips to speedily process the data.
In the past, the central processing unit was cumbersome, generated much heat and was very expensive. But with the rise of microprocessors, a miniaturized cpu, it is now very portable, inexpensive and faster than the previous CPU.
