1. SOFTWARE It Consists of a series of instructions that tells the computer what to do. It is collection of programs. Software is set of instruction which are developed by the programmers to solve specific problems. The programs are written in computer languages such as FORTRAN, Basic, Pascal C,C++ etc. SOFTWARE ARE DIVIDED INTO TWO TYPES 1.System software 2.Application software SYSTEM SOTWARES The system software is set of instruction which are designed by programmer for the use of computer. These software contribute to control and performance of the computer. such programs are given the collective name system software. These software provide a platform to user to work with computer.

2.  SYSTEM SOFTWARES ARE DIVIDED INTO FOUR TYPES Operating systems Operating systems Drivers Drivers Translators Translators Languages Languages  OPERATING SYSTEM an integrated set of programs that is used to manage the various resources and over all operations of a computer is called operating system. It acts as a bridge between user and hardware of computer. It is the first program installed on your computer. The functions of operating system are to Schedule and loading of programs. Schedule and loading of programs. Control over hardware resources. Control over hardware resources. Control over the selection and operation Control over the selection and operation of devices used for input,output or storage. of devices used for input,output or storage. Memory management. Memory management. EXAMPLES OF OPERATING SYSTEM windows 98, window xp, window vista window 07 windows 98, window xp, window vista window 07 DOS(Disk operating system) DOS(Disk operating system) LINUX LINUX UNIX UNIX

3. WINDOWS OPERATING SYSTEM Window is an application program in Microsoft windows operating system runs in a rectangular area of the desktop. this rectangular area is called window. Microsoft windows is an operating system. window is graphical user interface in contrast to the DOS, which is command line interface. An interface determine how you interact with your computer to do things like entering data or running programs like changing fonts numbering lines, creating tables etc  DOS :DISK OPERATING SYSTEM it is command line interface operating system. it have no graphical user interface. it works on commands. You have to give command for each task. EXAMPLES OF COMMAND USED IN DOS CLS Command: it clear the screen of monitor. CLS Command: it clear the screen of monitor. TIME: It show time on system TIME: It show time on system DATE: It shows date on system DATE: It shows date on system DIR:Entire directory is shown. DIR:Entire directory is shown. VER: It will show version of operating system. VER: It will show version of operating system. FORMAT: It is used to format the disk. FORMAT: It is used to format the disk.

4.  DRIVER The type of system software require to run peripheral devices such as mouse,keyboard,floppy disk,CD-ROM,Modem,Printer,etc. this type of software is called device Driver. when you purchase a hardware device, you also receive a disk containing a device driver.  TRANSLATOR it is system software to convert program into machine language. As machine language is only language that computer can recognize and act on directly. when we write program it is in high level language it is converted into machine language by translator. Types of translator interpreter interpreter Compiler Compiler Assembler Assembler  LANGUAGE A Computer language is a mean of communication between the user and computer. A computer language is set of instructions. to make programs these instruction are written under some rules. Types of programming languages Low level or machine language Low level or machine language Intermediate or Assembly language Intermediate or Assembly language High level language High level language

5. APPLICATION SOFTWARE It is the set of instructions which are developed by the computer user themselves to solve their specific problems. These programs are written in computer language such as FORTRAN,Basic, C++. Application software is developed with the help of system software. without the help of system software a common user is unable to use a computer. Application software can be further subdivided into following groups. PRODUCTIVITY SOFTWARE PRODUCTIVITY SOFTWARE WORDS PROCESSING SOFTWAREWORDS PROCESSING SOFTWARE SPREAD SHEETS SOFTWARESPREAD SHEETS SOFTWARE DATA BASE MANAGEMENT SOFTWAREDATA BASE MANAGEMENT SOFTWARE GRAPHICS SOFTWARESGRAPHICS SOFTWARES COMMUNICATION SOFTWARECOMMUNICATION SOFTWARE BUSINESS SOFTWARE BUSINESS SOFTWARE EDUCATION SOFTWARE EDUCATION SOFTWARE ENTERTAINMENT SOFTWARE ENTERTAINMENT SOFTWARE

7. WORD PROCESSING SOFTWARE Word processing software helps you to produce documents such as reports,letters,and scripts.e.g MS-word,notepad,Word pad.  SPREAD SHEETS SOFTWARE spreadsheets software helps you to work with numbers. an electronic spreadsheet is a table of rows and columns used to store data and manipulate any kind of numeral data.e.g MS-excel  DATABASE MANAGEMENT SOFTWARE DBMS helps you to work with database. Data manager are application software packages that computerized everyday task of recording and filing information. They offer a way to keep organized, readily accessible records. MS-Access, My SQL,ORACLE etc.  GRAPHICS SOFTWARES These helps you to draw pictures, images animation, graphs charts.  COMMUNICATION SOFTWARE These software allows your computer to talk to other computer. it enables the transfer of file between a PC and other computer.It also allows you to send /receive Faxes directly.