Linux, along with Microsoft Windows and Apple OS X, is one of the most important operating systems for PCs. Linux systems are installed on many large servers and are used on numerous smartphones and tablets running on Android. There used to be prejudices that Linux was supposedly too complex and inconvenient to use, but today they have been overcome. Of course, Linux doesn't work quite like Windows, but switching from Windows to Linux is no more difficult than switching from Windows 7 to Windows 8. At the same time, most Linux distributions are free, and also much more reliable than Windows. Linux also does not have viruses and Trojans.