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

Jul 23, 2025 · A computer virus is a type of malicious software program ("malware") that, when executed, replicates itself by modifying other computer programs and inserting its code.

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 …

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.

May 22, 2025 · What Is a Computer Virus? A computer virus is a program. Like other programs, it’s defined by what it does, and the big thing a virus does is replicate itself.

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 …

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 …

Dec 18, 2017 · A computer virus is a program or piece of code designed to damage your computer by corrupting system files, wasting resources, destroying data or otherwise being a nuisance. Viruses …

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 …