Main Classification of Computer

Main Classification of Computer (Classic View) :

                                         1. Micro Computer.
                                         2. Mini Computer.
                                         3. Mainframe Computer.
                                         4. Super Computer.

1. Micro Computer :
A single user computer (Basic Desktop Computer) falls into micro computer. It is called micro computer since the main processor of the central processing unit is a microprocessor. Here microprocessor is comprises of control unit and ALU (arithmetic and logic unit). Micro computer is relatively small in size and when a keyboard, mouse and monitor are connected it is used as a personal computer. The memory unit of a micro computer remains outside the micro processor.

2. Mini Computer :
Mini computer is a multi user system. Which has more than one terminal in the Central processing unit and it is faster and much more powerful than microcomputer.

3. Mainframe Computer :
Mainframe Computer is also a multi user system. It is faster and much more powerful than the Mini computer. Mainframe Computer has more than hundred terminals to connect peripheral devices in the same Central Processing Unit.

4. Super Computer :
A super computer as its name suggest is a very powerful computer. It is very fast and costly than a general computer. The processing speed of a super computer is more than ten thousand as compared to a general computer. So, it can process a huge volume of data in a very short period of time.

Classification of Computer (User's Point of View):

Laptop Computer:
A laptop computer or notebook computer is a small computer that can carry easily. All the parts of a laptop computer are compact in size. So, users can work on it while traveling or even outdoors. A laptop computer can perform all the tasks that a general computer does. It has a build in key board, pointing device and a non-bulky screen and it can run both on batteries and from an external adaptor that charges the battery while supplying power. Even it has external ports to connect peripheral devices.

Desktop Computer:
A desktop computer is a personal computer which is small enough to fit on a table or desk. Desktop computers have a separate key board, mouse and monitor. In spite of them a audio device and a Uninterrupted Power Source (UPS) is connected to a desktop computer when utility power is loss then the computer can run about 15 minutes. Which is generally called UPS backup. Other peripheral devices can be connect to a desktop computer in different port of the CPU.

***PC Stands for Personal Computer ***

Pocket PC:
A pocket PC is a compact version of a full sized computer that can be use in home or office and small enough to fit in a shirt's pocket. Although they are the size of a small diary, pocket PCs are proper computers. They have many of capabilities of full size computers.

Tablet PC:
A tablet PC is a flat panel portable PC in a form of a slate. User can enter information by typing the screen by finger or electronic pen. User can use the screen just as would a mouse to do things like select, drag and open files. In spite of that user can also use the screen a place of a key board to hand write notes and communications.

Handheld Computer:
A handheld computer is a portable computer that is small enough to be held one hand. Handheld computer is capable of storing thousands of address, appointment and memos. So, it is also called Personal Digital Assistants (PDA). Handheld computers have extremely small screens and key boards. User can connect a handheld computer to a desk top computer to exchange information between the two.