What is a computer virus ? – Computer hope

computer virus

What is a computer virus?

In computer technology, the computer virus is the malicious software program, a form of malware. By definition, viruses exist on local disk drives and spread from one computer to another through sharing of “infected” files. Common methods for spreading viruses include floppy disks, FTP file transfers, and copying files between shared network drives.

Once installed on a computer, a virus may modify or remove application and system files. Some viruses render a computer inoperable; others merely display startling screen messages to unsuspecting users.

Advanced antivirus software programs exist to combat viruses. By definition, antivirus software examines the contents of local hard drives to identify patterns of data called “signatures” that match known viruses. As new viruses are built, antivirus software manufacturers update their signature definitions to match, then deliver these definitions to users via network downloads.

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Types of Viruses

1.Boot Sector virus.

This is one of the most dangerous viruses out there. If your system ever gets infected by this virus then you don’t have any other choice apart from complete system format. This virus infects your devices master boot record which is really hard to correct.

2.Polymorphic virus

This virus has the ability to replicate itself automatically. With every replication, it changes its binary code. Hence it becomes really difficult for antivirus programmes to detect them. As they count as a different file apart from known signatures.

3.Multipartite virus

This virus can spread in many forms. It spreads very quickly using multiple forms. It can execute on a click of the certain file also. The virus can also correct boot files and can attach itself with executable files.

4.Resident virus

This virus has an ability to reside in the user’s system. Hence it can also execute itself even when the host file is not executed. So it’s also one of the difficult viruses to detect. As these types of viruses keep working in the background.

These were the most dangerous viruses which can be really hard to remove. So, if you find something unusual happening in your system, then you should update your system and do a complete scan using your antivirus software.

When was it most difficult for you to handle a virus? Let us know about your queries in the comments section below.


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