Linux has changed in to a unique system for servers due to security and stability nature of open source. Lower cost, easier maintenance and less vulnerability, and more stability is because of choosing this operating system for the company's software products. Moreover, due to its flexibility provides the possibility of developing more services. Also the design of this system leads to better performance of it compared to the other systems.
Linux in terms of security has various methods of security control that makes it difficult as much as possible the non allowed penetration to operating system. High speed of Linux operating systems is another advantage of this system.