Write a short note on Operating System (OS)
Operating System (OS):
An Operating System is a collection of programmers that controls the overall operation of a computer. It allows users to format disks, create, print, copy, delete, and display files, control most input/output operations execute programmers, allocate memory locations, process interrupts, etc. It provides users interphase with computing resources. It processes users' commands. In a multi-user system. It allows several users to share CPU on the timeshare basis, to share other system resources, it performs job scheduling, prevents interference between different users, between users and OS's, provides memory management, etc. in short we can say that an OS monitors the execution of users programs and the use of resources available in computer are CPU, memory and I/O devices . In a multi-user system, a resource is used by a number of programs and hence, the OS has to maintain a schedule. the scheduling will decide the order in which resources will be allocated if several programmers want to use it. Usually, operating systems are large. Most of them are too large to be present in memory at a time. Therefore, they can be divided into a number of parts. Some portion of the OS must always be present in the memory. This section performs basic operations such as studying and terminating user programs. Allocations of memory and files and basic input and output operators. Interrupts are also handled by this resident portion of OS. The portion of the OS which is always present in the memory called nucleus or Kernel. The Kernel is a master's program in OS. It coordinates all other parts of the operating systems. It is also called a supervisor. Other portions of the OS, which are brought in to the memory when needed and removed when not needed is called transient programs.
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