WHAT IS COMPUTER?
The computer is an electronic machine which changes data (input) into useful information (output). According to the data , a computer has four types of devices.
(1) Input Devices (2) Processing Device (3) Storage Device (4) Output device.
INPUT DEVICES. Input is the process of entering data and programs into the computer system. The computer devices which are used to enter information/data into the computer are called INPUT DEVICES.
PROCESSING DEVICE. Processor works according to the instructions and converts input into output. You may call the processor as the brain of computer.
STORAGE DEVICES. Storage devices are used to store data, information and instructions.
OUTPUT DEVICES. Output is the process of producing results from the data for getting useful information. Output devices are used to show results.
DATA / INFORMATION / INSTRUCTIONS. Computer are designed to work with a type of information, commonly referred as DATA. Data comes in many forms, whether it is written data (such as a letter to a friend), audio data (like a song), video data (like a popular movie or DVD), and more. The type of input which tells the computer how to process or work on the given data is called instructions. The result or the output which the computer gives, bases on the data and instructions is called information.
TYPES OF COMPUTER. Computers can be classified by size and power. Generally, there are four main categories of computer.
SUPERCOMPUTERS. A supercomputer is a computer that has the best processing technology of current time. A supercomputer is focused on performing capacity tasks involving intense calculations such as weather forecasting, and complex scientific calculations.
MAINFRAME COMPUTERS. Mainframe computers are capable of handling and processing very large amount of data quickly. These computers are large and powerful. A mainframe computer is used by hundreds of people at the same time. Mainframe computers are used in large organizations such as Govt banks, etc.
MINICOMUTERS. Minicomputers are large and powerful computers but not as powerful as mainframe computers. These computers serve less users at a time. Now, minicomputers are called midrange computers.
MICROCOMPUTERS. Microcomputers are the most common kind of computers used by people today. These computers are single user computers and also known as personal computer (PC). There are different types of microcomputers.
DESKTOP MODEL. These computers are designed to fit comfortably on top of a desk, typically with the monitor sitting on top of the computer.
TOWER MODEL. Tower refers to a computer in which the power supply, motherboard and all the devices are stacked in a cabinet.
LAPTOP, NOTEBOOK, & PALMTOP COMPUTERS. These are portable computers. All the components including screen are in one case. Palmtop computers literally fits into your palm.
SMARTPHONES AND PDAs. PDA stands for PERSONAL DIGITAL ASSISTANT. Smartphones and PDAs are small handheld computers with limited hardware and processing capacity.
HANDHELD GAME CONSOLE. These are game console computers used to play games and are portable. These are small in size and have a screen and buttons to play any game.