What's the difference between 4wd and AWD?

Related questions

1. Which tires do I put chains on 4wd?
2. How fast can you drive with snow chains?
3. Do you need chains for 4 wheel drive?
4. Which is better FWD or AWD?
5. Does Camry have AWD?
6. Is AWD good for winter driving?
7. Is AWD OK for snow?
8. Whats faster AWD or FWD?
9. Is AWD really worth it?
10. Will snow tires help front wheel drive?

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