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

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.

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.

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.

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.