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SOFTWARE Are the programs which are written by different programming languages. These programs are: a series of instruction that tells the computer what to do. There are three main types of software: 1-System software 2-Application software. 3-Programming languages 2 Chapter 3

TYPES OF SOFTWARE 3 SOFTWARE PROGRAMMIG LANGUAGES APPLICATION SOFTWARE SYSTEM SOFTWARE

System software helps run the computer hardware and computer system. These are program which control the operations of the computer and its devices. There are two types of system software: 1- Operating System. 2-Utilities programs SYSTEM SOFTWARE

1- Operating System(OS)

The operating system ( OS ) sometimes called the platform on which the computer work. It is the most basic program in a computer Operating System(OS)

Functions of Operating System: 1-start the computer. 2-system security. 3-control a network. 4-running applications. 5-providing user interface. 6-managing resources. 7

DOS (Disk Operating System). Windows : a graphical operating environment Windows(95/98/ME/XP/2000/VISTA/ WINDOW7) Linux. Unix : used on microcomputers and internet servers. Windows NT : for powerful workstations & networks. Mackintosh (Apple’s Mac OS ) 8 Examples of Operating System:

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These software are used to help the user communicate between the computer and different devices or peripherals connected to the computer. There are some types of utility programs which must be used: 1-Anti-virus programs. 2-CD/DVD burning. 3-File conversion. 4-File compression. 5-Backup programs Utility Programs

Application software allows end-users to accomplish one or more specific tasks. These are programs written by programmers in a company to help the user do a specific job. Examples are: 1-word processing –example: Microsoft Word. 2-spreadsheet-example:Microsoft Excel. 3-Database managers –example : Microsoft Access. 4-Graphics-example:Photoshop. 5-Presentation-example:Microsoft Power point. 6-Multimedia. 7-Drowing APPLICATION SOFTWARE

MS Paint MS Word MS Power point MS Excel MS Access Notepad

14 1- LOW level languages: Example: Machine language Assembly language 2-High level languages: Example: C / C++ / JAVA / BASIC 3- PROGRAMMING LANGUAGE

Viruses computer virus is : a computer program that can copy itself and infect a computer (programs, documents, databases and more…) Chapter 4

Types of Computer Viruses Macro viruses Worms Network Viruses Boot Virus Trojan Horses viruses 16

Sources of Computer Viruses Three primary sources : 1- The Internet *Via downloads and exchanges. 2-Diskettes *Exchanging disks 3-Computer networks *Can spread from one network to another. 17

how do you know if you have a computer virus?! your computer shuts down by itself your computer gets really slow If you open a website it closes by itself unexpected error messages halting the system lack of storage capability 18

How to Protect Your Computer from Viruses 1-Do not uses any diskettes from unreliable sources. 2-Backup your files periodically. 3-Delete s from unknown or suspicious, untrustworthy (unreliable)sources 4-Never open a files from attached to an unless you know what it is, even if it appears to come from a friend. 5-Update your antivirus software at least every two weeks. 6-Download files from the internet only from legitimate and trustworthy sources. 19