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The notion of software
The program - is a specific set of ordered operations for a computer to perform. The collection of all programs designed to run on a computer, called the software computer.
A computer is considered as a system consisting of interrelated parts: hardware (technical devices) and software.

Application Software
System Software
Systems of programming
Computer programs

Systems of programming
System software includes the operating system and service programs.
Operating System - a set of programs that provide operation of all computer devices and gives the user access to computer resources.
The most common operating system for personal computers:
Windows
Apple

System Software
hardware
interface
Hardware and software
interface
Custom
interface
Means to ensure the relation ship between the objects of this system is called interface.
The computer is part of the "man - computer" system.
Facilities
interaction
human and
computer
Facilities
interaction
hardware and
program
ensuring
Interface
Facilities
interaction
between
devices
computer

Systems of programming
To record the programs used
specific languages -
programming languages (formal languages)
Complex software designed
to develop computer programs
a programming language,
called programming system
Programming - is the process of creating programs, the development of all types of software

Presentation Software
Text
editors
Electronic
tables
Graphic
editors
Control systems
database
Multimedia
players
General purpose applications

Applications for special purposes
Publishing
system
Accounting
programs
Computer-aided system
CAD design
Programs of computer modeling
Mathematical
packages
Geoinformation
system
Textbooks, exercise machines, dictionaries

is system software that manages computer hardware and software resources and provides common services for computer programs.
Operating system (OS)