Lesson 7 of 10 – Operating System
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Operating System

An operating system is a collection of programs that manages all the resources of a computer system. It works as a bridge between the user and the hardware.

Operating System = User + Hardware Manager
It controls the computer and helps all programs run properly.

What is Operating System?

The operating system is the most important system software in a computer. It controls the hardware, manages memory, runs software, and gives the user a simple way to work with the computer. Without an operating system, a computer cannot work properly.

Functions of Operating System

Scheduling

The operating system decides which task should run first and how the CPU will share its time. This helps the computer work smoothly.

Memory Management

The operating system manages RAM and other memory areas. It gives memory to programs when needed and removes it when the task is complete.

Security

The operating system protects the computer from unauthorized access. It helps keep files, folders, and user accounts safe.

Interaction with Software

The operating system allows software programs to run and communicate with hardware devices. It provides the environment needed for applications to work.

Device Management

The operating system controls input and output devices such as keyboard, mouse, printer, and scanner. It ensures these devices work correctly.

File Management

The operating system helps create, save, open, copy, move, and delete files and folders. It keeps data organized on the computer.

Types of Operating System

Batch OS

Batch operating system processes jobs in batches one after another. Users do not interact directly during processing.

Time Sharing OS

Time sharing operating system allows many users to use the system at the same time. CPU time is shared among users and tasks.

Distributed OS

A distributed operating system works with several connected computers. It manages resources and tasks across different machines.

Network OS

Network operating system manages computers that are connected in a network. It helps users share files, printers, and internet resources.

Real Time OS

Real time operating system gives output instantly. It is used where timing is very important, such as medical devices and industrial systems.

Advantages of Operating System

  • Provides a GUI interface
  • Supports resource sharing
  • Makes the computer user-friendly
  • Helps in easy updates and maintenance
  • Allows smooth operation of software and hardware

Disadvantages of Operating System

  • If the operating system fails, the whole system may stop working
  • It may be difficult to use some operating systems without training
  • It uses system memory and storage space

Difference between GUI and CUI

GUI (Graphical User Interface)
  • Uses icons, buttons, and windows
  • Easy to use
  • Supports multitasking
  • Requires more memory
CUI (Character User Interface)
  • Uses commands and text
  • Difficult for beginners
  • Works through keyboard commands
  • Requires less memory
💡 Remember
The operating system is the main control program of the computer. It manages hardware, software, memory, files, and user actions.

🧠 Quiz

OS acts as interface between?