Security features that are in today's modern day operating systems

 Write a 1,200 word (excluding references) research paper that answers the following question:

Describe, compare, and contrast the security features that are in today's modern day operating systems.   Remember modern operating systems include the operating systems found on desktops, laptops, and servers but also mobile devices.

Please provide examples in your paper and use references that are <=5 years old (but you can use some older sources when discussing older features/OS)