It is a data processing machine, which accepts data and instructions.
It is called a computer system, as it is not a single machine but a collection of many devices which work together to perform a task.
DATA PROCESSED INFORMATION 2. Output to a Computer system. 2. Input to a Computer system. 1. End product of Data Processing. 1. Collection of Facts & Figures. INFORMATION DATA
Places where Computers are Used
The influence of computers is universal
Categorization of Computers Categorization of Computers Based on Size Based on Purpose Microcomputers Minicomputers Mainframe Super Computers PC Laptop Palmtop Analog Computers Hybrid Computers Digital Computers
Analog Computers : Analog computer works on the principle of analogous data. The Computers which can process analog signals, is know as Analog Computer. For eg. Pressure gauge, ECG Machine etc. Digital Computers : Digital computer works on the principle of binary system. Each and every instruction and data are to be converted in 0’s and 1’s which the machine understands.
Micro Computers : Micro computers, also called Personal computers are small enough to be kept on the table. They use a Silicon chip, called microprocessor.
Personal Computer : Commonly seen in the form of Desktop Computers used at offices, homes, shops, schools etc. Types of Microcomputers
Laptop : Also called as Notebook, can be used easily by carrying it from one place to another.
Palmtop : It is a kind of Micro computer which fits in the hand/palm and can be carried in a pocket . It works with the help of a pen which is used to select things on the screen.
Mini Computers : Mini computer is larger and more powerful than a PC. They work at high speed and support many users at the same time .
Mainframe Computers : Mainframe computer is very large, powerful and expensive. It has ‘thousands’ of PC’s attached to it. They occupied an entire room.
Super Computers : Super computer is the fastest computer used till today. They are being used a lot in research work, to process complex scientific calculations.