Types of Software

Definition of Software Engineering

Software Development Life Cycle (SDLC)

Types of Software

Role of Software Engineer

Software is a collection of programs, instructions, and related data that tells a computer what to do and how to perform a particular task.

Software is mainly classified into two main types:

System Software and Application Software.        

1. System Software

System software controls and manages the computer hardware and provides a platform for running application software.

It acts as an interface between the user/application software and computer hardware.

Examples:

• Operating systems – Windows, Linux, Android
• Device drivers
• Language translators – Compiler, Interpreter, Assembler
• Utility programs – Antivirus, Disk Cleanup

Example: Windows manages the computer's hardware and allows other programs to run.

 

Functions of System Software

1.                      Manages computer hardware.

2.                      Controls memory and CPU.

3.                      Manages files and storage.

4.                      Controls input and output devices.

5.                      Provides a platform for application software.

6.                      Provides security and system management.

 

Types of System Software

A. Operating System

An Operating System (OS) is the most important system software. It manages hardware resources and provides services to application programs.

Examples:

• Windows
• Linux
• macOS
• Android
• iOS – iPhone, First released in June 2007

Functions:

• Process management
• Memory management
• File management
• Device management
• Security
• User interface

Example: When you open MS Word, the operating system allocates memory and CPU resources to it.

B. Device Drivers

A device driver is software that allows the operating system to communicate with a hardware device.

Examples:

• Printer driver
• Graphics driver
• Keyboard driver
• Audio driver
• Network driver

Example: When you connect a printer to a computer, the printer driver helps the operating system communicate with the printer.

C. Language Translators

Computers understand machine language, but programmers generally write programs using high-level or assembly languages. Language translators convert these programs into machine-understandable instructions.

There are three major types:

1. Compiler

A compiler translates the entire source program into machine code before execution.

Examples: C, C++, Java compiler.

Advantages:

• Faster execution after compilation
• Reports errors during compilation

2. Interpreter

An interpreter translates and executes a program line by line.

Example: Python commonly uses an interpreter-based execution approach.

Advantage:

• Easy to test and debug individual sections.

3. Assembler

An assembler converts an assembly language program into machine language.

Assembly language → Assembler → Machine code

D. Utility Software

Utility software helps users maintain, protect, and optimize a computer system.

Examples:

• Antivirus software
• Backup software
• Disk cleanup tools
• File compression software
• Disk management tools

Functions:

• Protects against malware
• Creates backups
• Removes unnecessary files
• Compresses files
• Monitors system performance

2. Application Software

Application software is designed to help users perform specific tasks or solve particular problems.

Unlike system software, application software is mainly concerned with user-oriented tasks.

Examples

• MS Word → Creating documents
• MS Excel → Calculations and spreadsheets
• PowerPoint → Presentations
• Google Chrome → Web browsing
• Photoshop → Image editing
• VLC → Playing multimedia (VideoLAN Client)

Types of Application Software

A. General-Purpose Software

General-purpose software is developed to perform common tasks required by many users.

Examples:

• MS Word
• MS Excel
• PowerPoint
• Web browsers
• Media players

Example

MS Word can be used by:

• Students for assignments
• Teachers for notes
• Businesses for reports
• Writers for documents

Therefore, it is general-purpose software.

B. Special-Purpose Software

Special-purpose software is developed to perform one particular type of task or solve a specific problem.

Examples:

• Railway reservation software
• Billing software
• Payroll software
• ATM software (Automated Teller Machine)
• Hospital management software

Example

An ATM system is designed mainly for banking transactions such as:

• Cash withdrawal
• Balance enquiry
• Deposit
• Fund transfer

Therefore, it is special-purpose software.

C. Customized Software

Customized software is developed according to the specific requirements of a particular person or organization.

Examples:

• A college's customized student management system
• A company's employee management system
• A hospital's customized patient management system

Example

Suppose college needs software with:

• Student attendance
• Examination management
• Fee management
• Results
• Student records

A software company can develop a system specifically for that college. This is customized software.

3. Web-Based Software

Web-based software is accessed through a web browser rather than being completely installed on the user's computer.

Examples:

• Gmail
• Google Docs
• Online banking
• Online shopping websites
• Learning management systems

Advantages

• Can be accessed from different devices
• Usually requires less local installation
• Easy to update centrally
• Useful for remote access

4. Mobile Application Software

Mobile applications are software programs designed primarily for smartphones and tablets.

Examples:

• WhatsApp
• Google Maps
• Mobile banking apps
• Educational apps
• Shopping apps

They are generally developed for platforms such as Android and iOS.

5. Embedded Software

Embedded software is software built into a hardware device to control its functions.

It is commonly found in:

• Washing machines
• Microwave ovens
• Cars
• Smart TVs
• Digital cameras
• Medical equipment
• Smart watches

Example

A washing machine contains software that controls:

• Water level
• Washing time
• Spin speed
• Temperature

The software is embedded inside the device.

6. Open-Source and Proprietary Software

Software can also be classified according to how its source code and usage rights are provided.

Open-Source Software

The source code is made available under an open-source license, allowing users and developers to study, modify, and redistribute it according to the license terms.

Examples:

• Linux
• LibreOffice
• Mozilla Firefox

Proprietary Software

The software is controlled by its owner or organization, and its source code is generally not publicly available.

Examples:

• Microsoft Windows
• Microsoft Office
• Adobe Photoshop

Difference Between System Software and Application Software

System Software	Application Software
Manages computer resources	Performs user-specific tasks
Works closely with hardware	Works mainly for the user
Usually starts with or supports the system	Usually launched when required
Provides a platform for applications	Runs on the platform provided by system software
Examples: Windows, Linux, drivers	Examples: Word, Excel, Chrome

Simple Example

Think of a restaurant:

• System software is like the kitchen infrastructure that makes everything work.
• Application software is like the specific services provided to customers.

Similarly, the operating system provides the environment, while applications perform tasks for the user.