What is a processor? A processor is also known as CPU (central processing unit). The CPU is the brains of the computer where most calculations take place. It is the most important element of a computer system. The CPU itself is an internal component of the computer.
The processor basically gives out instructions to the computer telling it what to do.
What does a processor do? The processor in a computer refers to the part of a computer system which follows the computer program's instructions given. It's like the computer has a brain and it tells the computer what to do. It interprets programs, and processes data.