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Computer Virus





                                                                                 Chapter
                                                                                 03





                                Your Aim

                                to learn about:
                                   What is a Computer Virus?                     Types of Computer Viruses
                                   How does a Computer get Infected with a Virus?
                                   How do you know if your PC has a Virus?
                                   How to protect your PC from a Virus?          Malware
                                   Antivirus                                     Firewall


                  Data  and information  stored  on a  computer  are  two  of the most important  assets for  an
                  organisation or an individual. No one wants to lose their data or information. Therefore, people
                  adopt preventive measures to protect their computer systems and data from any kind of threat
                  or risk. One common risks is a virus attack.

                      WHAT IS A COMPUTER VIRUS?

                  A computer virus is a ‘piece of code’ or program developed to corrupt data or program files
                  stored on a computer system. It enters in the computer without the user’s permission, and the
                  user may not even realise that the system is infected. Viruses typically infect only one computer.
                  However, if the computer is a part of a network, then the computer virus may spread to other
                  systems much like a human virus. Once a virus infects a computer, it can disrupt the normal
                  functioning of the computer's resources, such as processing power, memory, and installed
                  programs. A virus can slow down the computer's performance or even damage the hard disk
                  irreparably, leading to a loss of data.
                  VIRUS stands for Vital Information Resources Under Seize.
                  Harms Caused by Computer Viruses

                  Different viruses will affect your computer in different ways:

                       They can corrupt system files.
                      They can destroy some or all of your data.
                       They can decrease the processing speed of the computer.

                       They can reduce or block the memory of the computer or hard disk.
                       They can prevent you from restarting your computer or cause it to restart repeatedly.
                       They can send e-mails from your account without your knowledge.




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