What does a PCS do?

Answer 1

PC is short for Personal Computer.

To help people to do things - such as finding information, writing documents, viewing pictures, listening to sounds, etc., PCs have lots of special hardware (pieces of electronic equipment) and software (programs) inside them to make them do millions of calculations every second.

More detail

A computer is something which computes, which means it is something which works out the results of calculations.

The PC is just one type of many different kinds of computers and was designed to be affordable enough to be bought and used by ordinary people.

There are many other kinds of computers, ranging from huge and very powerful mainframes - which are designed to be bought and used by big organisations like industrial and research companies, universities and government departments - down to tiny on-chip microcomputers which are so small that you need a microscope to see them - designed to be used inside other equipment and organisms - and thousands of different sizes of computers are available in between those two extremes.

Answer 2

PCS enables a person carrying a pocket-sized phone to be contacted at the same number no matter where the person is