Archive for Operating System


Operating System

An operating System (OS) is an intermediary between users and computer hardware. It provides users an environment in which a user can execute programs conveniently and efficiently.

In technical terms, It is a software which manages hardware. An operating System controls the allocation of resources and services such as memory, processors, devices and information.


An operating system is a program that acts as an interface between the user and the computer hardware and controls the execution of all kinds of programs.

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Windows Short-Cut Key Combination

Windows system key combinations

  • F1: Help
  • CTRL+ESC: Open Start menu
  • ALT+TAB: Switch between open programs
  • ALT+F4: Quit program
  • SHIFT+DELETE: Delete item permanently

Windows program key combinations

  • CTRL+C: Copy
  • CTRL+X: Cut
  • CTRL+V: Paste
  • CTRL+Z: Undo
  • CTRL+B: Bold
  • CTRL+U: Underline
  • CTRL+I: Italic

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Computer Terms and their Meanings

Some Computer Terms:

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3D reference use this reference to analyze data that is in the same position on multiple worksheets in the same workbook
ALU Carries all mathematical and logcal decisions
Antivirus software  

“A computer program used to scan a computer’s memory and disks to identify, isolate, and eliminate viruses”

App Typically used to describe a software program on a smartphone or tablet computer
Application A computer program designed for a certain type of work like word processing
Application software “A category of software programs that helps you perform a specific task such as word processing (can also be called application programs, applications, or programs)”

Classifications of Operating System


Operating systems can be classified into different types based on their interface, user friendliness, and functionality. Different types of operating systems are:

  1. Character user interface (CUI)-based operating systems
  2. Graphical user interface (GUI)-based operating systems
  3. Single-user operating systems
  4. Multi-user operating systems
  5. Single-tasking operating systems
  6. Multitasking operating systems
  7. Real-time operating systems

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