1. Operating System By :- Anupam Gupta

2. 5 types of Operating System 0 MACINTOSH 0 I O S 7 0 WINDOWS 0 LINUX 0 UNIX

3. MACINTOSH 0 The Macintosh marketed as Mac, is a line of personal computers (PCs) designed, developed, and marketed by Apple Inc. It is targeted mainly at the home, education, and creative professional markets. Steve Jobs introduced the Macintosh 128K on January 24, 1984. This was the first mass-market personal computer featuring a graphical user interface and mouse.

4. WINDOWS 0 Windows 8 is a personal computer operating system developed by Microsoft as part of Windows NT family of operating systems. Development of Windows 8 started before the release of its predecessor, Windows 7, in 2009.

5. LINUX 0 Linux is a Unix-like and POSIX-compliant computer operating system assembled under the model of free and open source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released on 5 October 1991 by Linus Torvalds. Linux was originally developed as a free operating system for Intel x86-based personal computers.

6. UNIX 0 Unix is a multitasking, multi-user computer operating system that exists in many variants. The original Unix was developed at Bell Labs research center by Ken Thompson, Dennis Ritchie, and others. From the power user's or programmer's perspective, Unix systems are characterized by a modular design that is sometimes called the "Unix philosophy," meaning the OS provides a set of simple tools that each perform a limited, well-defined function, with a unified file system as the main means of communication.

7. I O S 7 0 iOS 7 is the seventh major release of the iOS mobile operating system designed by Apple Inc as the successor to iOS 6. It was announced at the company's Worldwide Developers Conference (WWDC) on June 10, 2013, and was released on September 18, 2013.[2] iOS 7 includes a redesigned user interface and numerous functionality changes. The design of iOS 7's new elements was led by JonyIve, Apple's Senior Vice President of Design. As of December 2013, iOS 7 has been installed on 78% of supported devices.