Please clarify your question.

Computers are available in different shapes, sizes and weights, due to these different shapes and sizes they perform different sorts of jobs from one another. They can also be classified in different ways. All the computers are designed by the qualified computer architectures that design these machines as their requirements.
* Super computer
The biggest in size, the most expensive in price than any other is classified and known as super computer. It can process trillions of instructions in seconds. This computer is not used as a PC in a home neither by a student in a college.
* Mainframes
Another giant in computers after the super computer is Mainframe, which can also process millions of instruction per second and capable of accessing billions of data.
* Minicomputer
This computer is next in he line but less offers less than mainframe in work and performance. These are the computers, which are mostly preferred by the small type of business personals, colleges, etc.
* Personal computers
Almost all the computer users are familiar with the personal computers. They normally know what the personal computer is and what are its functions.
* Notebook computers
Having a small size and low weight the notebook is easy to carry to anywhere. A student can take it with him/her to his/her school in his/her bag with his/her book.