Answer:

1. CPU. Stands for "Central Processing Unit." ... For many years, most CPUs only had ONE PROCESSOR, but now it is common for a single CPU to have at least two processors or "processing cores." A CPU with two processing cores is called a dual-core CPU and models with four cores are called quad-core CPUs.

2. A computer is a machine or device that performs processes, calculations and operations based on instructions provided by a software or hardware program. It is designed to execute applications and provides a variety of solutions by combining integrated hardware and software components.

3. The keyboard is the piece of computer hardware used to input text, characters, and other commands into a computer or similar device.

Even though the keyboard is an EXTERNAL peripheral device in a desktop system (it sits outside the main computer housing), or is "virtual" in a tablet PC, it is an essential part of the complete computer system.

Microsoft and Logitech are the PROBABLY the most popular physical keyboard manufacturers, but many other hardware makers also produce them.

Explanation: