Types of computers
• On the basis of work
• On the basis of brand
• On the basis of size
• On the basis of model
On the basis of work
On the basis of work performance, computer can be classified into three (3) classes they are as follows-
1. analog computer
2. digital computer
3. hybrid computer

On the basis of brand
There are many brands of computer. Hundreds of computer is involved in computer manufacturing and they give their own brand name. But it is true that all the compute can be classified under three types from the technological point of view.
They are as follows-
1. IBM PC
2. IBM Compatible
3. Apple/Macintosh
On the basis of size
They are designed to process complex scientific jobs. These computers have the largest, fastest and most expensive systems in the world. On the basis of size computer can be classified as follows-
1. Mainframe Computer
2. minicomputer
3. microcomputer
On the basis of model
Basically, IBM computers are classified into three models. They are as follows-
1. XT (Extended Technology)
2. AT (advanced Technology)
3. PS(Personal System-2)