General Classification of Computers

Computers for Individual Users:

Most computers are meant to be used only one person at a time. The six primary types of computers this category are-
(i)     Desktop
(ii)   Work station
(iii)  Notebook computers
(iv)   Tablet computers
(v)   Handheld computers
(vi)  Smart phones

These systems are all examples of personal computer (PCs) –a term that refers to any computer system that is designed for use by a single person. 

Desktop Computer: A PC that is designed to sit on a desk or table, following are some desktop computer.
Desktop Computer
Desktop Computer

Work Station: 
Work Station
Work Station
A work station is specialized; single-user computer that typically has more power and features then standard PC.

Notebook Computers
Notebook Computer
Notebook Computer
These computers easily fit inside a briefcase. Because people frequently set these devices on their lap, they are also called laptop computers. Because of their portability, Notebook PCs fall into a category of devices called mobile computers –systems small enough to carry by their user.

Tablet PCs: 
Tablet Computer
Tablet PCs offer all the functionality of a notebook PC, but they are higher and can accept input from a special pen- called a stylus or a digital pen that is used to top or write directly on the screen.

Handheld PCs: 
Handheld Computer (PDA)
Handheld Computer (PDA)
Handheld personal computers are computing devices small enough to fit in your hand. Example- PDA (personal digital assistant)

Smart phones: 
Smart Phones
Smart Phones
These phones offer advanced features not typically found in cellular phones. These festures include web and e-mail access, special software such as personal organizer, or special hardware such as digital cameras or music players.

Computers for organizations: Some computers handle the needs of many users at the same time. These powerful systems ate most often used by organization. Generally, each user interacts with the computer through his or her  own device, freeing people from having waited their turn at a single keyboard and monitor. Following are some example of computers for organization.

Network Server: 
Network Server
Network Server

Today, most organizations’ networks ate based on personal computers. Individual users have their own desktop computers, which are connected to one or more centralized computers, called network server. A network server is usually a powerful personal computer with special software and equipment that enable it to function as the primary computer in the network.

Mainframe computer:
Mainframe Computers
Mainframe Computers

Mainframe computers are used in large organization such as insurance companies and banks, where many people frequently need to use the same data. Most mainframe systems are designed to handle only a specific set of tasks. You can access the mainframe’s resources through a device called a terminal and in some environments you can use a standard PC to access the mainframe. Terminals are of two types-
i.               Dump terminal- does not process or store data it is in simply an input/output device.
ii.      Intelligent terminal- can perform some processing operations, but it usually does not have any storage.

Mini computer: 
Mini Computers
Mini Computer
The capabilities of a minicomputer are somewhere between those of mainframes and personal computers. For this reason, minicomputers are often called mid range computers. Although some  “minis” are designed for a single user, the most powerful minicomputers can serve the input and output needs of hundreds of users at a time. User can access a central minicomputer through a terminal or a standard PC.

Super computer: 
Super Computer
Super Computer

Super computers are the most powerful computers made, and physically they are some of the largest. These systems can process huge amounts of data, and the fastest supercomputers can perform more than one trillion calculations per second. Some supercomputers can house thousands of processor.


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