Chapter Three Software and Operating Systems What is software? How software is developed (Analysis, Design, Programming, and Testing) What are software updates? What are Operating Systems? Types and examples of Operating Systems Different versions of Windows What is a GUI? Introduction to BIOS Mobile application types and roles (VoIP, messenger, …)

What is software ? Software is a collection of instructions that enable the user to interact with a computer or to have it perform specific tasks for them.

-Without software, computers would be useless. -Software is sometimes called an application. - Smartphone applications are also software. -Examples are: -Microsoft Word, -Excel, Chrome, - Games, -WhatsApp application, -BBM application….

How software is developed (Analysis, Design, Programming, and Testing) A Software Development Life Cycle is a series of steps, or phases, that provide a model for the development and lifecycle management of an application or piece of software.

The methodology process can vary across industries and organizations, but the common software lifecycle is 1.Analysis 2. Design 3.Development 4. Testing, 5. Release and Maintenance

What are software updates ? An update is a new version of the software. Software companies frequently release software updates to add new features or to fix bugs in previous software versions. These updates are also applicable on Smartphones applications.

What are Operating Systems ? Operating Systems are the most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs. Operating systems perform basic tasks, such as -recognizing input from the keyboard, -sending output to the display screen, - keeping track of files and directories on the disk, -controlling peripheral devices such as disk drives and printers.

Types and examples of Operating Systems Operating systems for personal computers : - Windows - Linux - Unix - MAC OS Operating Systems for Smartphones : - Android - IOS Operating systems of old personal computers mono- task: - MS-DOS

Different versions of Windows Windows 8.1 Windows 8 Windows Vista Windows XP Windows M Windows 2000 Windows 98 Windows NT 4.0 Windows 95 Windows NT 3.51 Windows NT 3.5 Windows 3. Windows 2. Windows 1.01

What is a GUI? A GUI (usually pronounced "GOO-ee") is a graphical operating system. It is a type of interface that allows users to interact with electronic devices through graphical icons and visual indicators such as secondary notation rather than Text Interface. Most of today’s operating system are GUI.

Introduction to BIOS BIOS is short for BASIC INPUT OUTPUT SYSTEM. - It is a set of built-in software routines that allows the computer to start. - It also tells the computer the date/time. BIOS lets the computer boot from specific locations and lets the computer check that all requirements to boot are satisfied.