As you already know that a computer network means a group of networked computers or computers that are linked by means of a communication system.
A network can means a small group of linked computers to a chain of a few hundred computers of different types such as PCs (personal computers), minis, mainframes etc. spread around the world.
Therefore, networks vary in size, complexity and geographical spread.
In general, computers are classified on the basis of their geographical spread and on this basis.
There are four types of computer networks, listed here:
You will learn all about the above network types one by one divided into separate tutorials.