Ubuntu is a very popular Operating System, that employs the Linux kernel. Even though it's used primarily on PCs, its server version has been gaining in popularity these days as well. Ubuntu is one of the lightest Linux releases out there and it is compatible with almost any kind of hardware, which makes it a universal OS. It's also very stable and secure and has an at least a 5-year support life cycle, so you can get official security and performance updates. Unlike alternative OS's, Ubuntu is distributed without license fees and you'll be able to modify its core, or all of the countless packages it comes with, in any way you find fit. This will enable you to install the optimal software environment for your web applications whatever their requirements. Because of the popularity of the OS, Ubuntu has vast developer and user communities, which means that you will always find numerous materials online related to any question or problem that you may have.