What is an operating system?


What is an operating system?


±An operating system is the most important software that runs on a computer. It manages the computer's memory and processes, as well as all of its software and hardware.
±It also allows you to communicate with the computer without knowing how to speak the computer's language.
±Without an operating system, a computer is useless.



an operating system





Characteristics of Operating System


Memory Management − Keeps track of the primary memory, i.e. what part of it is in use by whom, what part is not in use, etc. and allocates the memory when a process or program requests it.


Processor Management − Allocates the processor (CPU) to a process and deallocates the processor when it is no longer required.


Device Management − Keeps track of all the devices. This is also called I/O controller that decides which process gets the device, when, and for how much time.


File Management − Allocates and de-allocates the resources and decides who gets the resources.


Security − Prevents unauthorized access to programs and data by means of passwords and other similar techniques.





Types of Operating Systems

±WINDOWS
±MAC OS
±Unix
±LINUX
±ANDROID



Types of Operating Systems




The advantages of using Operating System


±Allows you to hide details of hardware by creating an abstraction
±Easy to use with a GUI
±Offers an environment in which a user may execute programs/applications
±Operating System acts as an intermediary among applications and the hardware components
±It provides the computer system resources with easy to use format




Operating Systems Aren’t Just for PCs

When we say “computers” run operating systems, we don’t just mean traditional desktop PCs and laptops. Your smartphone is a computer, as are tablets, smart TVs, game consoles, smart watches, and Wi-Fi routers.

Operating Systems Aren’t Just for PCs


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