IGCSE ICT

ICT

what is ict?

• ICT stands for Information communication and Information
• Any technology that allows us to process data and to communicate.
• Ex. Phones, Internet, Networks

Data & information

• data is simply any numbers, letters or symbols that can be entered into a computer system.
• Information is DATA that has a meaning
• Ex. Date, Password

System

• A system has 3 stages
• INPUT - PROCESS-OUTPUT
• To Feed in - To do something with input - To give the Result
• Ex. Typing "apple"
• Input= "apple" - Process= Typing - Output= Shown on screen

Computer

• A device that stores and processes information according to a set of instructions.
• Ex. A Laptop, Desktop Computer

Hardware & software

HArdware

• The physical parts of the computer that can be touched, and feel
• Ex. Mouse , Keyboard, Printer

Software

• Instructions that tell computer hardware what to do
• Ex. Windows, Apple, Linux, Ubuntu

main computer components

Central Processing Unit (CPU)

• The CPU is the 'brain' of the computer. It is the device that carries out software instructions.

Main Memory

• Also known as primary storage.
• Stores the data to be processed by CPU

Random Access Memory (RAM)

• temporarily stores the instructions that the computer is running,
• a volatile storage device.

Read-only Memory (Rom)

• to hold a small, special piece of software: the 'boot up' program.
• non-volatile storage

input devices

• Devices that pass data into the computer.
• Ex. keyboard, a mouse and a webcam

Output devices

• Devices that take data from the computer
• Ex. monitor, a printer and a loudspeaker

Backing Storage

• Devices that can store data in a computer system (Excluding ROM/RAM)
• Also known as secondary storage
• Ex. Hard drive, a CD-ROM, a floppy disc

REferences

• www.igcseict.info
• www.google.com
• www.ksigcseict.weebly
• IGSCE ICT book

Submission by: Ashwin Chawla