Computer Virus

Subject: Computer Science

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Overview

Computer virus is a term given to man-made computer software or system to destroy computer programs or computer.This note provides an information about computer viruses, its symptoms and effects.
Computer Virus

Computer virus is a term given to man-made computer software or system to destroy computer programs or computer. Virus destroys data, useful application, programs and even the operating system. Computer virus hide themselves in other host files. They are not visible to us. The viruses can corrupt, delete files and programs.

Purposes of Creating Computer Viruses

The first computer virus "C-Brain" was developed in 1987 to stop illegal reproduction of software developed from Alvi's Brain Computer shop.

But nowadays, viruses are developed for the following purposes:

  • To stop the software piracy.
  • To remind the incidents that happened at different time.
  • To destroy and steal data, information and files.
  • To earn money

Effects of Computer Viruses

Computer Viruses affect the computer in many ways. It can destroy data, files or programs and cause the system malfunction. The destructive effects of viruses are different according to their types.

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Some of the effects of virus are as follows:

  • The speed of computer is reduced.
  • The instruction of program is reduced.
  • Data may be lost in the database.
  • Virus may transfer from one file to another.
  • It corrupts the system data.

Spreading of Computer Viruses

When a host file or program is used, the virus become active and tries to infect other files.

Computer viruses can spread from one computer to another computer by the following ways:

  • By sharing of infected storage device.
  • By using pirated software.
  • By downloading files from unreliable web sites.
  • By exchanging data, information or files on the network.

Symptoms of Computer Viruses

All the computer viruses have different characteristics. But all viruses affects the computer anyway.

If the computer is affected by the viruses, we can find the following symptoms:

  • Changes in the size of files.
  • Opening of the program takes more time.
  • Programs hang frequently.
  • Missing of files or appearing of unexpected files.
  • Appearing of unusual error messages.
Things to remember
  • Computer virus is a term given to man-made computer software or system to destroy computer programs or computer.
  • Viruses can destroy data, files or programs and cause the system malfunction.
  • The destructive effects of viruses are different according to their types.
  • The first computer virus "C-Brain" was developed in 1987 to stop illegal reproduction of software developed from Alvi's Brain Computer shop.
  • When a host file or program is used, the virus become active and tries to infect other files. 
  • It includes every relationship which established among the people.
  • There can be more than one community in a society. Community smaller than society.
  • It is a network of social relationships which cannot see or touched.
  • common interests and common objectives are not necessary for society.
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Questions and Answers
Computer virus is a destructive program that disturbs the normal functioning of a computer. It is designed intentionally to harm data, information and programs of the computer. When a virus enters in file or program, it becomes active and performs its destructive tasks.
Any four reasons for creating computer viruses are as follows:

  • To stop software piracy.
  • To remind the incidents that happened at different time.
  • To earn money.
  • To expose the programming capabilities of a programmer.
Any four destructive effects of computer viruses are as follows:

  • Computer virus can degrade the overall performance of the computer system.
  • Computer virus can change the content of the files and codes of programs.
  • Computer virus can even destroy file allocation table (FAT) of a disk and files becomes inaccessible.
  • Computer virus can delete, steal and destroy data, information and programs.
Computer viruses can spread from one computer to another computer by following ways:

  • By sharing of infected portable devices.
  • By using pirated software
  • By opening virus infected email or attached file.
  • By downloading files from unreliable web sites.
Any four symptoms of computer viruses are as follows:

  • Changes in the size of files or executable files.
  • Opening of the programs takes more time or fails to open.
  • Programs hang frequently or restart automatically.
  • Missing of files or appearing of unexpected files.

System infector virus infects the various parts of the operating system or master control program software.

Some reasons for creating viruses are:

1) To stop the software piracy.
2) To entertain the users by displaying interesting messages or pictures.
3) To destroy data, information and files.
4) To expose the programming ability.

Viruses spread from one computer to other computers by following ways:

1) Using pirated software.
2) Sharing of portable disks among the computers.
3) Downloading files or programs from unsecured web sites.
4) Exchanging of data or files over a network.
5) Opening virus infected E-mails.
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