What Is a Computer Virus? How It Spreads & How to Stop It | Avast
You use your computer every day to work, shop, stream, and connect with the people and things you care about. But what exactly is a computer virus, and how does it manage to spread so fast? In this video, we explain what a computer virus is, how it attaches to files and programs you trust, and how it activates, copies itself, and spreads to other files and devices—just like a biological virus.