3. An operating system (sometimes abbreviated as "OS") is the
program that, after being initially loaded into the computer by a
boot program, manages all the other programs in a computer. The
other programs are called applications or application programs. The
application programs make use of the operating system by making
requests for services through a defined application program
interface (API). In addition, users can interact directly with the
operating system through a user interface such as a command
language or a graphical user interface (GUI). NEXT OPERATING SYSTEM
(OS)
4. APPLICATION Application software is all the computer
software that causes a computer to perform useful tasks beyond the
running of the computer itself. A specific instance of such
software is called a software application, application program,
application or app. NEXT
5. UTILITIES Utility software is system software designed to
help analyze, configure, optimize or maintain a computer. Utility
software usually focuses on how the computer infrastructure
(including the computer hardware, operating system, application
software and data storage) operates. Due to this focus, utilities
are often rather technical and targeted at people with an advanced
level of computer knowledge - in contrast to application software,
which allows users to do things like creating text documents,
playing video games, listening to music or viewing websites.
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