Any virus will by definition make unauthorised changes to a computer, which is undesirable even if no damage is done or intended.

Oct 8, 2025 · A computer virus is a type of program that attaches itself to a host to multiply and spread to other computers. Here's a computer virus definition, examples of viruses, and more.

Jul 23, 2025 · What is a Computer Virus? A computer virus is a type of malicious software program ("malware") that, when executed, replicates itself by modifying other computer programs and …

Chances are you’ve heard how important it is to keep viruses out, but what is a computer virus exactly? A computer virus is a type of malicious software, or malware, that spreads between computers and …

Mar 15, 2024 · What is a virus (computer virus)? A computer virus is a type of malware that attaches itself to a program or file. A virus can replicate and spread across an infected system and it often …

Computer Virus: What are Computer Viruses? What is computer virus? A computer virus is a type of malware that attaches to another program (like a document), which can replicate and spread after a …

A computer virus is a malicious application or code used to perform destructive activity. Learn exactly what it is, how it works, examples, and more.

Dec 18, 2017 · One of the oldest types of computer threats, viruses are nasty bits of malware that hijack your computer’s resources to replicate, spread, and cause all sorts of chaos.

Jan 8, 2026 · A virus consists of a set of instructions that attaches itself to other computer programs, usually in the computer’s operating system, and becomes part of them.

Jul 16, 2025 · A computer virus is malicious software crafted to replicate, spread, and cause harm. Think of it as an unwelcome guest wreaking havoc in your home—but instead of throwing parties, it’s …