This document discusses key concepts in IT including hardware components, computer performance factors, storage measurements, and types of software. It describes the main hardware components that make up a computer system unit such as the CPU, motherboard, RAM, hard disk drive, and video card. It explains how memory and storage impact computer performance and outlines different storage measurements like bytes, kilobytes, megabytes, gigabytes, and terabytes. It also lists common input devices like keyboards and mice and output devices like screens and printers. Finally, it defines operating systems and software applications, providing examples of each.

1. Concepts of IT

2. HardwareIt refers to the physical components of your computer such as the system unit, mouse, keyboard and monitor.

3. System Unit Components CPU (Central Processing Unit) or the Processoris the brain of the computer.The faster the CPU, the faster the whole computer. The hard disk drive is the "data center" of your PC. It holds all of your programs and data.The sound card is an expansion card that allows the computer to send audio information to any compatible audio device such as a set of speakers.The motherboard is the circuit board to which all the other components of the computer connect in some way. All plug into the motherboard's various slots and connectors. The CPU also plugs into the motherboard via a Slot.RAM (random access memory) is a temporary storage device where files are storedThe video card is an expansion card that allows the computer to send graphical information to a video display device such as a monitor or projector.

4. Input/Output PortsUniversal Serial Bus (USB)

5. Parallel Port

6. Network Port

7. Serial PortComputer PerformanceMemory

8. Storage

9. Multitasking

10. DiskDefragmentingMemory & storageRAM (Temporary )

11. CDs , DVDs, Flash memory, Memory Card, Hard Disk Drive (Permanent )Measurement of storage capacity It is important that you understand a little about the measurements used to define storage capacities.Byte: There are eights bits in a Byte.

12. KB - Kilobyte: There are 1024 bytes in a KB.

13. MB - Megabyte: There are 1024 KB in a MB.

14. GB - Gigabyte: There are 1024 MB in a GB.

15. TB - Terabyte: There are 1024 GB in a TB.Input Devices Keyboard, Mouse, Scanners, Web Cam, MicrophonesOutput Devices Screens, Projectors, Printers, Speakers and headphones

16. SoftwareOperating system is a special type of program which loads automatically when you start a computer.E.g. Windows, Macintosh, Linux Software applications is a type of programs which could be used once the operating system has been loaded.E.g. Microsoft office Word, Computer games