An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs. The operating system is a component of the system software in a computer system.Application programs usually require an operating system to function.xamples of popular modern operating systems include Android, BlackBerry, BSD, Chrome OS, iOS, Linux, OS X, QNX, Steam OS, Microsoft Windows (and variant Windows Phone), and z/OS.
The aura is an electromagnetic field that surrounds every creature that exists. A form of energy emanating from your body, your aura can tell a lot about you, from your personality to your innermost emotions and conflicts.
Aura is experienced by 10-20% of migraineurs. Aura is defined as focused symptoms that grow over 5-15 minutes and generally last about an hour. In most cases, the migraine headache follows the aura. However the two events can happen at the same time, or the aura may develop after the headache starts.