Are compact flash cards backwards compatible?

Related questions

1. How long do memory cards last?
2. What's a CF card?
3. Why is CFast so expensive?
4. Are CF cards still used?
5. Are memory cards and SD cards the same thing?
6. Are CF or SD cards faster?
7. What is a CF adapter?
8. Are CF cards more reliable than SD?
9. What is the difference between CF Type 1 and Type 2?
10. Which is better SD or CF cards?

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8. #resolution
9. #backwards
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12. #cfast
13. #speeds
14. #designed
15. #flash
16. #older
17. #compactflash
18. #compatible