An operating system is a program that manages computer resources and acts as an interface between hardware and users. It provides services like program execution, input/output operations, file manipulation, communication, and error detection. Operating systems aim for convenience, efficiency, and ability to evolve while supporting different user interfaces like graphical, command line, web-based, and touch-based. On mobile devices, operating systems support multiple screens, provide convenience, and enable faster, smoother, and updated experiences with feasible displays. Operating systems also collect usage statistics, monitor performance, and anticipate future needs to enhance the system and facilitate billing.

1. Operating System
An Overview
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2. Operating system
♣ A program that controls the execution of
programs
♣ An interface between a user and hardware
♣ an Operating System is a computer program
that manages the resources of a computer.

3. Services provided by operating
system
♣ program execution
♣ i/o operations
♣ file system manipulation
♣ communication
♣ error detection

4. Objectives of operating system
♣ convenience
♣ efficiency
♣ ability to evolve

7. User interaction with computer
♣ GUI(graphical user interface)
♣ CUI(command user interface)
♣ WUI(web based user interface)
♣ TUI(touch user interface)

9. operating system in mobile
♣ Support multiple screens
♣ Convenient
♣ Faster and smoother
♣ Updated
♣ Feasible display

10. Services by operating system to
accounting
 Collect usage statistics
 Monitor performance
 Used to anticipate future enhancement
 Used for billing purpose