Ubuntu is a widely used desktop Operating System, which uses the Linux kernel, but its server version is getting pretty popular too. The main reason is the fact that the operating system is really light and it'll function on almost any hardware without any issues, utilizing its resources to the max. Ubuntu is also pretty reliable and secure and all the Long-Term Support (LTS) releases are supported for at least 5 years, which warrants that you will have a risk-free and dependable software environment on your website hosting server all the time. Also, Ubuntu has one of the largest user communities around the world, which means that if you experience any difficulty or have any question, you'll find lots of resources on the web. One of the major advantages of this OS is that it comes with thousands of software packages that can be freely customized according to your needs and the requirements of the apps which you wish to run, not to mention that you will not have to pay any kind of license fees at any time. In contrast, other OS's are paid and their program code is not accessible, thus it can't be changed.