Explanation: What is an operating system is?
Everything you do on the Computer, runs programs, also referred to as the Software. To be able to this at all, you need a user interface. This is provided by the operating system.
- An operating system is a bunch of different programs. They are necessary in order to be able to the Computer at all to start.
- The operating system contains interfaces that enable the Interaction of Hardware and Software.
- You start a program, the operating system, all required Hardware components. You hear, for example, the Internet, music, controls the operation of the system, the activation of the network adapter. Likewise, the Sound is addressed.
- The tasks will be processed automatically in the Background. Something is not working as desired, there is a bug in the operating system. The correct configuration is important.
- In addition to the devices and file management, memory and process management are among the tasks of an operating system.

Apple's operating system Yosemite
Smartphone operating systems at a Glance
Also mobile devices such as Smartphones and Tablets need an operating system. However, the focus is partly on other functions than the Computer.
- Microsoft has developed for Smartphones running its own operating system. This bears the name of Windows Phone.
- For the majority of Apple mobile devices iOS is used. iPhone, iPad, iPod Touch, and Apple TV 2. Generation make use of this operating system. The Apple Watch has a custom watchOS.
- The most popular mobile operating system Android is based on the license-free Linux core. The System was developed by an Alliance of various companies. This is what Android always in connection is brought. However, companies such as T-Mobile, Acer, Samsung and many others were involved. The current Version is called "Lollipop". A developer Preview for Android M is already available.
In the next practice tip, you will learn what the term Cache means.