The document provides an overview of operating systems, including their structure, main functions, and popular examples. It discusses how operating systems control computer resources and provide an interface between hardware and software. The main functions of an operating system include process management, memory management, file management, security, and command interpretation. Popular single-user operating systems include DOS, while multi-user systems include Unix and Windows. In conclusion, operating systems are essential for running applications and enabling work to be done on a computer.

1. Operating
system
NAME:- SHAH ALAM
COURSE:-BCA 3SEM
SECTION:-D

2. Flow of presentation
❖Introduction
❖Structure of OS
❖Main function of operating system
❖Some popular operating system
❖Conclusion

3. Introduction
❖Operating system is a integrated set of program that control the
resources of the computer system and provide its user with an interface
or virtual machine that is easier to use than the bare machine.
❖Operating system is a software , which make a computer to actually
work.
❖It is the software that enable all the program we use.
❖OS acts as an interface between the application program and the
machine hardware.

4. Structure of OS
❖The two primary objective of an OS are:-
o Make a computer system easier to use:-An operating system hides details
of hardware resources from the programmer and other user and provides
them with a convenient interface for using a computer system.
oManage the resources of a computer system:-An operating system
manage all the resources of a computer system. Efficient and fair sharing
of computer resources among user and/or program is a key goal of all
operating system.

6. Main function of operating system
❖A seprate module of operating system software perform each of the function:-
1. Process management:-process management module take care of creation
and deletion of processes and providing mechanism for synchronization and
communication among processes.
2. Memory management:-memory management take care of allocation and de-
allocation of memory space to program in need of this resources.
3. File management:-it take care of file-related activities such as organization
storage , retrieval , naming , sharing and protection of files.

7. Main function of operating system
1. Security :-security module protects the resources and information
of a computer system against destruction and authorized access.
2. Command interpretation:-command interpretation take care of
interpreting user command , and directing system resources to
process the command.

8. Some popular operating system
❖Single user system:-They are popularly associated with desk top
operating system which run on standalone where no user account are
required.
For ex:- DOS.
❖Multi user system:-Provide regulated access for a number of user by
maintaining a database of known users . Refer to computer system that
support two or more simultaneous users.
For es:- unix , windows.

9. Conclusion
❖Without operating system the computer can not run the
application and we cannot do work on computer.
❖Therefore operating system is very important in computer.

10. Thank you