What is a computer virus?

• A. A type of harmless software
• B. A program that enhances computer performance
• C. A type of malicious software that replicates by inserting copies of itself into other programs
• D. A form of web application

Answer: (C)

A computer virus is defined as a type of malicious software that has the capability to replicate itself by inserting copies of its own code into other programs, files, or even the boot sector of a computer. This process often leads to various harmful effects, including corrupting or deleting files, stealing personal information, or causing systems to become inoperable. Viruses can spread quickly across computers, especially through shared files, email attachments, or downloads from the internet.

The definition emphasizes that viruses do not enhance performance or serve any harmless purpose; rather, their primary function is to replicate and spread their damaging effects across systems. This clarity is essential for understanding cybersecurity since one of the main goals of antivirus software is to detect and remove such malicious programs before they can cause significant harm.

Other choices refer to different types of software or applications that do not share the characteristics of a virus. For example, harmless software may exist for beneficial purposes, while programs that enhance performance, like optimization tools, serve entirely different objectives. A web application is a completely different category, typically meant for online functionality rather than the destructive nature associated with computer viruses.