Learn what a computer virus is, how it replicates, and what damage it can cause. Explore the history of computer viruses, from the first theoretical work by von Neumann to the first IBM PC virus Brain.

Learn what a computer virus is, how it works, and how to prevent and remove it. Find out the difference between viruses and malware, the history of computer viruses, and the types of viruses and their effects.

Basically, computer viruses are a kind of malware that install themselves on a device and multiply. Some viruses are designed to steal or corrupt data while others are created to destabilize a program or system and potentially make it unusable.

Learn what a computer virus is, how it differs from other malware, and how to protect your system from it. See examples of viruses, Trojans, worms, ransomware, and rootkits, and play a game to test your knowledge.

Learn what computer viruses are, how they spread, and what damage they can cause. Find out the difference between viruses, malware, worms, and Trojans, and how to prevent and protect against...

A computer virus is a malicious code or program designed to spread from one computer to another, causing damage to data and system operations. Learn how viruses work, signs to look out for, and the main types.

Learn what a computer virus is, how it works, and what damage it can cause to computer systems and data. Find out how to protect your computer from viruses and other cyber threats with Britannica's articles and resources.

Learn what a virus is, how it can damage or destroy data on a computer, and how to avoid it. Find out the difference between a virus, a worm, and a Trojan horse, and get tips on email safety and anti-virus software.

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 are unique from other forms of malware in that they are self-replicating — capable of copying themselves across files or other computers without a user's consent.