IT and Software
Introduction to computers
What is computer?
An electronic device that stores, retrieves,and processes data, and can be programmed with instructions. A computer is composed of hardware and software, and can exist in a variety of sizes and configurations.
Hardware & Software
The term hardware refers to the physical components of your computer such as the system unit, mouse, keyboard, monitor etc.The software is the instructions that makes the computer work. Software is held either on your computers hard disk, CD-ROM, DVD or on a diskette (floppy disk) and is loaded (i.e. copied) from the disk into the computers RAM (Random Access Memory), as and when required.
Types of Computers
Mini and Mainframe Computers
Very powerful, used by large organisations such an banks to control the entire business operation. Very expensive!
Cheap and easy to use. Often used as stand-alone computers or in a network. May be connected to large mainframe computers within big companies.