ICT-SKILLS (Class-9)

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 What is Computer System?

A Computer is an electronic machine that takes input from user, process the data and gives the desired result (output). It performs both mathematical and non-mathematical operations.

Categories of Computer:

Computer can be classified into two categories.

1. Hardware: Any physically components that we can touch, feel,& view are called hardware. Ex- Monitor, Printer, Motherboard, RAM, SSD, Pen drive, Mouse,etc.

2. Software: A Software is a set of programs or instructions that tells the computer what to do. Ex: MS-Word, Excel, PowerPoint, Scratch, etc.

Software are two types:

1. System Software: It is a type of program that is designed and managed to all hardware devices'- Operating System(Windows, 7,10,11)

2. Application Software: It is a type of software designed to help users perform specific task. Ex: MS-Word, MS-Excel, Photoshop, CorelDRAW.

Hardware categories four types 

1. Input Device: Input devices are the devices that are used to enter data and instructions into a computer. Ex: Keyboard, Mouse, Scanner, Mike, Digital Camera, Joystick..

  • Scanner: Scanner is an input device that is used to scan documents, photos, or images and coverts physical documents and images into digital format. Flatbed Scanner  and Handheld Scanner are the types of Scanners.
  • Webcam: Webcam is an input device that captures video and images and sends them to the computer. Online classes, Video conferencing, Face recognition are uses of Webcam.
  • Joystick: A Joystick is an input device used to control movement and direction in games and simulation programs.
  • MICR : MICR stands for Magnetic Ink Character Recognition. It is a technology used to read cheque details with the help of magnetic ink and special machines. Uses of MICR in bank.
2. Process Device: Process device are the devices that process and execute data and instructions given by the user.

  • CPU: The CPU is the main components of a computer that processes data and controls all operations. ALU, CU and Registers are the parts of CPU.
    (I). ALU: 


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