1. Introduction to Computing: Lecture 5
Computer Software

2. Overview This Lecture covers: The different types of software
Application software
System software etc.

3. Computer Software
“Software is a program that enables a computer to perform a specific task, as opposed to the physical components of the system (hardware)”. [
The term “software” was first used in this sense by John W. Tukey in 1957.
The theory that is the basis for most modern software was first proposed by Alan Turing in 1935.

4. Computer Software

5. Role of Computer Software
User
Software
Hardware
User interacts with applications software. Systems software enables the application software to interact with the computer and help the computer to manage its internal resources.
Applications
Software
Systems
Software

6. Application Software
Application Software consists of programs that tell a computer how to produce information. Some of the more commonly used packages are:
Word processing
Electronic spreadsheet
Database
Presentation graphics

7. Word Processing
Word Processing software is used to create and print documents. A key advantage of word processing software is that users easily can make changes in documents.

8. Electronic Spreadsheets
Electronic spreadsheet software allows the user to add, subtract, and perform user-defined calculations on rows and columns of numbers. These numbers can be changed and the spreadsheet quickly recalculates the new results.

9. Database Software
Allows the user to enter, retrieve, and update data in an organized and efficient manner, with flexible inquiry and reporting capabilities.

10. Presentation Graphics
Presentation graphic software allows the user to create documents called slides to be used in making the presentations. Using special projection devices, the slides display as they appear on the computer screen.

11. Systems software Application Software Systems Software Hardware
Systems software interfaces between the user or application programs and the computer hardware

12. System Software
It lies between application software and computer hardware.
The most important system software is the operating system.
Examples of operating systems:
Windows, DOS, Linux, UNIX

13. What is an operating system?
An OS is a computer program that:
Controls the hardware of the computer,
Enables you to communicate with the computer.
Details would be in next lecture.

14. Summary Details about different types of software.
Application software & system software.