Answer:
Explanation:
1 an operating system is a software programme required to manage and operate a computing device like smartphones, tablets, computers, supercomputers, web servers, cars, network towers, smartwatches, etc
2 MS-Windows.
Ubuntu.
Mac OS.
Fedora.
Solaris.
Free BSD.
Chrome OS.
CentOS
3 Five of the most common operating systems are Microsoft Windows, Apple macOS, Linux, Android and Apple's iOS.
4 The most well-known mobile OSs are Android, iOS, Windows phone OS, and Symbian.