An operating system manages a computer's memory and hardware, allows communication without knowledge of its underlying language, and is essential for a computer to function. Modern operating systems use graphical user interfaces (GUIs) accessed through mouse clicks. Popular modern operating systems include Android, iOS, Linux, Windows and macOS. Operating systems control basic functions, allow running of various applications, and have made personal computers ubiquitous through easy-to-use interfaces.

2.  An operating system is the most
important software on a computer. It
manages the computer's memory, and
all of its software and hardware. It also
allows you to communicate with the
computer without knowing its language.
Without an operating system, a
computer is useless.

3.  An operating system is the most
important software of the computer. Is
the one in charge of the memory
, process and all of its software and
hardware. A computer without an
operating system is useless

4.  Modern operating systems use a Graphical
User Interface, or GUI. A GUI lets you use
your mouse to click on icons, buttons, and
menus.
 It consists of a kernel and some system
programs. There are also some application
programs for doing work. The kernel is the
heart of the operating system. In fact, it is
often confused to be the operating system
itself, but it is not. An operating system
provides many more services than a plain
kernel.

5.  Some examples of popular modern
operating systems include
Android, BSD, iOS, Linux, Mac OS
X, Microsoft Windows, Windows
Phone, and Z/OS.

6.  Today’s modern operating systems do an
amazing variety of functions right out of the
box. Aside from controlling the most
rudimentary computer functions like disk
input/output, memory management, and
networking, an OS also allows the user to run a
variety of programs or applications which
can, among other things, display video and
play music, create and print complex
documents, and of course, access and surf the
internet. Indeed, the OS and its associated GUI
have made home-based personal computers
nearly as ubiquitous as televisions and
microwave ovens.

7.  GUI - Short for Graphical User Interface,
a GUI Operating System contains
graphics and icons and is commonly
navigated by using a computer mouse.
See the GUI definition for a complete
definition.

8.  A multi-user operating system allows for
multiple users to use the same computer
at the same time and different times.

9.  An operating system capable of
supporting and utilizing more than one
computer processor.

10.  An operating system that is capable of
allowing multiple software processes to
run at the same time.

11.  Operating systems that allow different
parts of a software program to run
concurrently.

12.  Operating systems usually come
preloaded on any computer that you
buy. Most people use the operating
system that comes with their
computer, but it is possible to upgrade or
even change operating systems.

13.  The three most common operating
systems for personal computers are
Microsoft Windows, Apple Mac OS
X, and Linux.