CentOS is an abbreviation for Community Enterprise OS. This is one of the leading Linux releases for servers and it is well known as being one of the most reliable and protected Operating Systems out there. CentOS is open-source software, which means that you will be able to personalize it in whatever way you see fit, adding and removing packages or altering the code of all of them. It's also free to distribute and use, so you will not have to pay any kind of license fees, which means that the overall price that you'll have to pay for a server running CentOS will be more affordable as compared to the price for a server running an alternative OS. What makes CentOS unique among various other Linux distributions is its huge developer society, which will help you find the reply to any question or problem you may have. Furthermore, each version that is released officially is supported for a decade, that is is a lot longer than with any alternative operating system. This means frequent safety and stability updates which will provide a great software setting for your web applications in the long run.