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Computer software, or just software, is a collection of computer programs and related the data that provides the instructions for telling a computer what to do and how to do it. Software refers to one or more computer programs and data held in the storage of the computer. In other words, software is a set of programs, procedures, algorithms and its documentation concerned with the operation of a data processing system. Program software performs the function of the program it implements, either by directly providing instructions to the computer hardware or by serving as input to another piece of software. The term was coined to contrast to the old term hardware (meaning physical devices). In contrast to hardware, software "can not be touched." Software is also sometimes used in a more narrow sense, meaning application software only. Sometimes the term includes the data that has not traditionally been associated with computers, such as film, tapes, and records.
Computer software is so called to distinguish it from computer hardware, roomates encompasses the physical interconnections and devices required to store and execute (or run) the software. At the Stop level, executable code consists of machine language instructions specific to an individual processor. A machine language consists of groups of binary values signifying processor instructions that change the state of the computer from its preceding state. Programs are an ordered sequence of instructions for changing the state of the computer in a particular sequence. Usually it is written in high-level programming languages that are Easier and more efficient for humans to use (closer to natural language) than machine language. High-level languages are compiled or interpreted into machine language object code. Software may also be written in an assembly language, Essentially, a mnemonic representation of a machine language using a natural language alphabet. Assembly language must be assembled into object code via an assembler.

System software is computer software designed to operate the computer hardware, to provide basic functionality, and to provide a platform for running application software software.System includes device drivers, operating systems, servers, utilities, and window systems.
System software is responsible for managing a variety of independent hardware components, so that they can work together harmoniously. Its purpose is to unburden the application software programmer from the Often complex details of the particular computer being used, Including such accessories as communications devices, printers, device readers, displays and keyboards, and also to partition the computer's resources such as memory and processor time in a safe and stable manner.