A computer virus is a type of malware that can replicate itself on your computer and spread to other devices.

Discover the types of malware in 2025, from backdoors to ransomware, and learn which families hackers use most in real-world attacks.

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 system down, plus what you need to know to stay ahead.