A system software component that is external to the operating system kernel. If the phrase is used to refer to the operating system itself, it is redundant because an operating system "is" software.

The rise of professional cyber crime groups and state-sponsored actors targeting critical infrastructure requires a move towards inherently secure ‘cyber immune’ systems, says Kaspersky CEO ...

Software used to control the computer and develop and run applications. It includes programs such as operating systems, database managers, compilers, Web servers, router operating systems and ...