Application software is not absolutely essential for running a system, but it makes the system more useful. The MS Office you find on Windows-based systems is a typical example of application ...

System software differs from application software because it integrates the computer’s capabilities. However, it isn’t involved in the tasks that benefit the end user.

You have application launchers that boot up a single computer application, utility programs that monitor your PC's performance and defend it from viruses, and most importantly, system programs.