Operating system Types Characteristics usage Goals

1. COMPUTER OPERATING SYSTEM
Presented By : Misbah Javid

2. OPERATING SYSTEM(OS)
 An operating system is a set of programs that coordinates
all the activities among computer hardware devices.
 It provides means for users to communicate with the
computer and other software.
 An operating system (OS) is a collection of software that
manages computer hardware resources and provides
common services for computer programs.

3. TYPES OF OPERATING SYSTEMS
• Multi-user
A multi-user operating system allows multiple users
to access a computer system at the same time.
• Single-user
Single-user operating systems have only one user
but may allow multiple programs to run at the same time.

4. CHARACTERISTICS OF OPERATING SYSTEM
 Time Sharing- Multiprogramming brought the idea of time
sharing: resources could be shared between different jobs, with each
job being allocated a portion of time to use a resource. Because a
computer is much faster than a human, time sharing is hidden from
the user—each user has the impression that the whole system is
serving them exclusively.
 Multiprocessing - In multiprocessing many programs can
process at the same time.

5. CHARACTERISTICS OF OPERATING SYSTEM
 Distributed Systems- A job that was previously done on
one computer can now be shared between computers
that may be thousands of miles apart.
 Real Time Systems - A real-time system is expected to
do a task within a specific time constraint.

6. USAGE OF OPERATING SYSTEM
• Many of today's computer use Window vista or Window
XP Which are two of Microsoft's operating
system(Dell,Hp,Intel,IBM,Compact).
• Mac OS X (Apple's) operating system.

7. GOALS OF OPERATING SYSTEM
Two major design goals for an operating system are:
 Efficient use of hardware.
 Ease use of resources.