This document provides an overview of computer software. It begins by defining software as computer instructions or data that can be stored electronically, in contrast to hardware which refers to physical devices. It then discusses the relationship between hardware and software, noting that both are necessary for a computer to function and that software refers to programs written in a language understood by computers. The document goes on to describe the two major types of software - system software, which acts as an interface between hardware and applications, and application software, which is designed to perform specific tasks. It provides examples and details of both types of software and outlines the typical software development life cycle.

1. COMPUTER SOFTWARE
Presented by
Md Arif Hossain
ID:182–15-11395.
Presented to
xxxxxxxxxx

2. COMPUTER SOFTWARE

3. What does the software mean ?
software means computer instrucation or data. Anything that can be
stored electronically is software, in contrast to storage devices and
display devices which are called hardware.
software is a recent development in human
history, and a fundamental topic of
the important age.

4. Relationship Between Hardware and Software:
Both hardware and software are necessary for a computer to do a
useful job. They are complementary to each other Hardware refers to
the physical devices of a computer system.
Software refers to a collection of programs Program is a sequence
of instructions written in a language that can be understood by a
computer . Software package is a group of programs that solve a
specific problem or perform a specific type of job

5. Hardware and Software :

6. Software Type :
Most Software can be divided into two
major categories.
 System Software : System Software is a type of computer
program that is designed to run a computers hardware and
application programs. If we think of the computer System
as a layered model,the system Software is the interface
between the hardware and user application.

7.  Application Software : Application Software refers to
all application collectively. This contrasts with system
software. Application Software are designed to solve a
specific problem or to do a specific task.

8. System software Details:
 System software is computer software which is used to control and
coordinate the computer hardware and to provide a environment for
executing application software. Various examples of system software
are operating system(OS), BIOS, device firmware, certain system
utility software which helps to configure, optimize and maintain the
computer, programming software such as assemblers, compilers and
debuggers etc.

9. Application software Details:
 1.Solve a specific problem or do a specific task.
2.Programs in a application software package are called application programs
and the programmers who prepare them are called application programmers.
3.Example of application software are word processing, inventory
management, preparation of tax returns and banking.
4.This software is also used to provide audio,video or multimedia
entertainment to the users.
5.Microsoft word,Microsoft excel and adobe photoshop are the example of
application software.

10. #Their are two kind of application softwere.
1.Custom-built software
2.Packaged software

11. *Custom-built software
 .The software are designed according to the requirement of a
particular customer.
.The professional team of programmers depending on the
requirements develops these programs.
.Cost of customized software is more than packaged software.
.Patient information system,inventory system,college
admission system and examination system are the example

12. *Packaged software :
 There are also known as OFF-THE-SHELF(Ready made) program. These
are designed for sale to the geberal public.
.Software developers also acquire packaged software for their ease.
.These facilitate the users in all field of life.
.Microsoft office package (Ms-word,Ms-excel etc), ORACLE, Graphics
software, Communication programs are the examples.

13. Software Development Life Cycle :
 1) Planning
 2) Requirement engineer
 3) Analyze
 4) Design
 5) Coding
 6) Testing
 7) Implementation
 8) Maintenance

14. Planning :
The most important parts of software development, requirement gathering
or requirement
analysis are usually done by the most skilled and experienced software
engineers in the organization.
After the requirements are gathered from the client, a scope document is
created in which
the scope of the project is determined and documented.

15. Requirement Engineer :
 Once the requirement analysis is done the next step is to clearly
define and document the product requirements and get them
approved from the customer or the market analysts. This is done
through an SRS (Software Requirement Specification) document which
consists of all the product requirements to be designed and developed
during the project life cycle.

16. Analyze :
 Requirement analysis is the most important and fundamental stage in SDLC. It
is performed by the senior members of the team with inputs from the
customer, the sales department, market surveys and domain experts in the
industry. This information is then used to plan the basic project approach and
to conduct product feasibility study in the economical, operational and
technical areas.

17. Design :
 The requirement specifications from first phase are studied in this
phase and the system design is prepared. This system design helps in
specifying hardware and system requirements and helps in defining
the overall system architecture.

18. Coding :
 Developers must follow the coding guidelines defined by their organization and
programming tools like compilers, interpreters, debuggers, etc. are used to generate the
code. Different high level programming languages such as C, C++, Pascal, Java and PHP
are used for coding. The programming language is chosen with respect to the type of
software being developed.

19. Testing :
 All the units developed in the implementation phase are integrated into a
system after testing of each unit. Post integration the entire system is tested
for any faults and failures..

20. Implementation :
 With inputs from the system design, the system is first developed in small
programs called units, which are integrated in the next phase. Each unit is
developed and tested for its functionality, which is referred to as Unit Testing.

21. Maintenance :
 There are some issues which come up in the client environment. To
fix those issues, patches are released. Also to enhance the product
some better versions are released. Maintenance is done to deliver
these changes in the customer environment.

22. *Any Question ?