Why do rental car companies require a deposit?

Related questions

1. Can you rent a car without a credit card?
2. Can someone else drive my rental car Hertz?
3. Do Europcar accept debit cards?
4. Can you rent a car with another person's credit card?
5. What is the deposit for Europcar?
6. What is Keddy By Europcar?
7. Can you pay for a rental car with a debit card?
8. Does Hertz charge a deposit?
9. Is Keddy the same as Europcar?
10. Does Hertz run a credit check?

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