What is Operating System?

OS is a resource allocator.Manages all resources.Decides between conflicting requests for efficient and fair resource use.OS is a control program.Controls execution of programs to prevent errors and improper use of the computer.Operating system is the one program running at all times on the computer(usually called the kernel),with all else being systems programs and application programs.

 

And write sevral your familiar operating systems in details.

IOS is an operating system developed by Apple Inc. Because of its own closed nature, it is very secure, no malicious or otherwise unauthorized software can be run on an iOS device.

 

Windows is which are developed, marketed and sold by Microsoft.The operating system for mainstream personal computers, tablets and smartphones. On PCs, Windows is still the most popular operating system. Most programs can run on it.

 

Android is a mobile operating system developed by Google. It is based on a modified version of the Linux kernel and other open source software, and is designed primarily for touchscreen mobile devices such as smartphones and tablets. Android has been the best-selling OS worldwide on smartphones since 2011 and on tablets since 2013. As of May 2017, it has over two billion monthly active users, the largest installed base of any operating system,