Railways Notes / Computer Awareness / Chapter 9
Chapter 9 of 33

Operating System

The system software that manages hardware and provides the platform for all other programs to run.

📖 ~4 min read 💻 RRB NTPC / Group D — Computer Awareness

What Is an Operating System?

An OS is system software that manages computer hardware, software resources, and provides common services for programs — acting as an interface between the user and the machine.

Functions of an OS

  • Process management — running and scheduling multiple programs
  • Memory management — allocating RAM to different programs
  • File management — organising data into files and folders
  • Device management — controlling input/output devices

Types of Operating Systems

TypeFeature
Batch OSProcesses jobs in batches without user interaction during execution
Multi-tasking OSRuns multiple programs simultaneously
Real-Time OSProcesses input and responds within a guaranteed time (used in medical, defence systems)
Distributed OSManages a group of independent computers as a single system
💡 Examples of popular OS: Windows, Linux, macOS, Android, iOS

💡 Want More? Get the Full eBook

This free chapter covers the key concepts. For complete coverage with 500+ MCQs, mock tests, and previous year analysis — grab the premium eBook.

📚 Browse Premium eBooks →