Basics of Computer Science – Virus

A virus is a computer code or program, which is capable of affecting your computer data badly by corrupting or destroying them.

Computer virus has the tendency to make its duplicate copies at a swift pace, and also spread it across every folder and damage the data of your computer system.

A computer virus is actually a malicious software program or “malware” that, when infecting your system, replicates itself by modifying other computer programs and inserting its own code.

Description: Computer Virus

Infected computer programs may include data files, or even the “boot” sector of the hard drive.

Types of Virus

Following are the major types of computer virus −


This is a computer program that replicates itself at a swift pace. Unlike a computer virus, it is self-contained and hence does not need to be part of another program to propagate itself.

Trojan Horse

A Trojan Horse is also a sort of destructive program that remains disguised in a normal software program. It is not exactly a virus, as it cannot replicate itself. However, there is possibility that virus program may remain concealed in the Trojan Horse.


It is similar to Trojan Horse, but Logic bombs have some specialty; these include a timing device and hence it will go off only at a particular date and time.

How Does Virus Affect?

Let us discuss in what ways a virus can affect your computer system. The ways are mentioned below −

  • By downloading files from the Internet.
  • During the removable of media or drives.
  • Through pen drive.
  • Through e-mail attachments.
  • Through unpatched software & services.
  • Through unprotected or poor administrator passwords.

Impact of Virus

Let us now see the impact of virus on your computer system −

  • Disrupts the normal functionality of respective computer system.
  • Disrupts system network use.
  • Modifies configuration setting of the system.
  • Destructs data.
  • Disrupts computer network resources.
  • Destructs of confidential data.

Virus Detection

The most fundamental method of detection of virus is to check the functionality of your computer system; a virus affected computer does not take command properly.

However, if there is antivirus software in your computer system, then it can easily check programs and files on a system for virus signatures.

Virus Preventive Measures

Let us now see the different virus preventive measures. A computer system can be protected from virus through the following −

  • Installation of an effective antivirus software.
  • Patching up the operating system.
  • Patching up the client software.
  • Putting highly secured Passwords.
  • Use of Firewalls.

Most Effective Antivirus

Following are the most popular and effective antivirus from which you can choose one for your personal computer −

  • McAfee Antivirus Plus
  • Symantec Norton Antivirus
  • Avast Pro Antivirus
  • Bitdefender Antivirus Plus
  • Kaspersky Anti-Virus
  • Avira Antivirus
  • Webroot Secure Anywhere Antivirus
  • Emsisoft Anti-Malware
  • Quick Heal Antivirus
  • ESET NOD32 Antivirus

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