How many popular operating systems are in use today?

Operating systems are the software that controls the way a computer works. There are many different operating systems out there, and they all have different features and benefits. The most popular operating systems today are Windows, Mac OS, and Linux. Windows is the most popular because it is the most widely used operating system. It is also the most expensive, but it is also the most secure. Mac OS is another popular operating system that is easy to use and has a lot of features. Linux is a very popular operating system that is free and open-source, which means that anyone can use it. Linux is also very easy to use, so it is great for beginners