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 …

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 …

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.

Mar 17, 2023 · What do viruses do? A virus is simply a computer program--it can do anything that any other program you run on your computer can do. Some viruses are designed to deliberately damage …

May 22, 2025 · What Is a Computer Virus, Really? You’ve heard the term, but what does it actually mean? Learn from our expert how these self-replicating programs sneak in, spread, and slow your …

A computer virus is an ill-natured software application or authored code that can attach itself to other programs, self-replicate, and spread itself onto other devices. When executed, a virus modifies other …

Oct 18, 2025 · 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.

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 …

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 …