Software is a collection of computer programs and related data that provide the instructions for telling a computer what to do and how to do.
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Types of Software
1. System software
2. application software
System software
It consists of several programs, which are directly responsible for controlling, integrating and managing the individual hardware components of computer system.
System software also provides the interface between the user and components of the computer. Depending on the functionally, the system software can be further divided into following categories:
1. Operating System
It consists of programs which control, coordinate and supervise the activities of the various components of a computer system. Its function is to provide link between the computer hardware and the user. It provides an environment to run the programs. eg. MS-DOS, Windows XP/98/2000, Unix, Linux, etc.
The operating system performs the following functions
a. It recognise input from keyboard, sends output to the display screen.
b. It makes sure that programs running at the same time do not interfere with each other.
c. It is also responsible for security, ensuring that unauthorised users do not access the system.
2. Device Drivers
A software, which is written with the objective of making a device functional when it is connected to the computer is called device driver. It is a system software that acts like an interface between the device and the user.
3. Language Translator
It helps in converting programming languages to machine language. The translated program is called object code.
There are three different kinds of language tranlator : Assembler, Complier and Interpreter.
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