In the material's typical distinction, a virus requires human interaction to spread, whereas a worm does not.

### Why this is right The material says a typical virus needs a human to run it and spread it. A worm can exploit file or information transport features to spread without human interaction. ### The concept These are typical distinctions, not a claim that every real-world sample follows a single pattern. Malware can combine techniques, and the lesson explicitly describes blended threats. ### Terms - **Blended threat**: Malware or an attack combining characteristics of more than one threat type. ### Remember Treat virus-versus-worm propagation as the stated typical distinction, while allowing for blended malware.