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 …

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 …

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, Really? You’ve heard the term, but what does it actually mean? Learn from our expert how these self-replicating programs sneak in, spread, …

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 …

Dec 20, 2024 · What is a Virus? A computer virus is a malicious program, script, macro, or code designed to damage, steal personal information, modify data, send e-mail, display messages, …

Computer viruses spread across systems, infecting programs & files with malicious code. Learn to scan for viruses (and try our free virus scanner), remove viruses, and protect your computer …

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 …

Sep 29, 2025 · A computer virus is a type of malicious software program designed to disrupt normal operations, steal information, damage files, or even give hackers remote access to …