Computer can be classified into three category. They are:

1. On the basis of work: The computers may be made for different purposed. Since they have been made be different purposes, the computers have different functions. On the basis of work, it is classified as:

2. On the basis of Size: Computer can be classified on the basis of size. The computer size is large, medium and small according to the need of people.

3. On the basis of Brand: Computer can be classified on the basis of Brand such as IBM PC, IBM Compatible and Apple.