Operating Systems: Types, Functions and Examples
An operating system is system software that manages computer hardware, software resources, and provides common services for computer programs. It acts as an intermediary between computer hardware and the end user.
Core Functions of an Operating System
An operating system performs multiple critical tasks to ensure efficient execution of programs and utilization of system resources.
Process Management
- The operating system creates, schedules, suspends, and terminates processes.
- It handles process synchronization and inter-process communication.
- It allocates processor time to different tasks using various scheduling algorithms.
Memory Management
- It tracks every byte of primary memory and manages allocation and deallocation.
- It coordinates the movement of data between main memory and secondary storage through virtual memory management.
- It ensures that different programs do not interfere with each other’s memory space.
File System Management
- It organizes data into logical units called files and directories.
- It controls access permissions for files to ensure data security.
- It manages storage space allocation on physical media like hard drives and solid-state drives.
Device Management
- It manages device communication via respective drivers.
- It controls hardware devices such as printers, keyboards, and displays.
- It handles input and output request queuing to optimize device utilization.
Types of Operating Systems
Operating systems are categorized based on their architecture, capabilities, and the environment they operate in.
| Type | Description | Key Characteristic | Example |
| Batch Operating System | Executes jobs in batches without manual intervention. | No direct user interaction during execution. | IBM z/OS |
| Time-Sharing Operating System | Allows multiple users to share computer resources simultaneously. | Uses CPU scheduling and multi-programming. | Multics, Unix |
| Real-Time Operating System | Processes data and events with strict time constraints. | High predictability and determinism. | VxWorks, FreeRTOS |
| Distributed Operating System | Manages a group of independent computers and makes them appear as a single system. | Resource sharing across multiple nodes. | LOCUS, Amoeba |
| Mobile Operating System | Designed specifically for smartphones, tablets, and mobile devices. | Optimized for touch interfaces and power efficiency. | Android, iOS |
Major Examples and Architectures
Different operating systems are tailored for specific hardware architectures and user requirements.
Desktop and Enterprise Operating Systems
- Microsoft Windows: A proprietary operating system family developed by Microsoft with a dominant market share in personal computing.
- Linux: A family of open-source Unix-like operating systems based on the Linux kernel, widely used in servers and supercomputers.
- macOS: The proprietary operating system developed by Apple for its Mac line of computers, built on the Unix architecture.
Mobile Operating Systems
- Android: A mobile operating system based on a modified version of the Linux kernel, developed primarily by Google for touchscreen devices.
- iOS: A mobile operating system created and developed by Apple Inc. exclusively for its hardware.
Quick Facts
- The first operating system was developed in the mid-1950s for the IBM 704 computer, known as GM-NAA I/O.
- Unix was developed in 1969 at AT&T Bell Labs by Ken Thompson and Dennis Ritchie.
- The Linux kernel was released in 1991 by Linus Torvalds.
- Real-time operating systems are widely used in air traffic control systems, industrial robots, and medical equipment.
- A kernel is the core component of an operating system that has complete control over everything in the system.
Originally written on
December 18, 2015
and last modified on
August 14, 2026.
