What is the difference between a preview and a trailer?

Related questions

1. Do trailers start at movie time?
2. How long are trailers at Regal?
3. What is the difference between promo and trailer?
4. Where are PJ Trailers made?
5. What is the difference between a teaser and a trailer?
6. Why is a movie trailer called a trailer?
7. Is a teaser a trailer?
8. How long are trailers at AMC?
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Tags

1. #never
2. #longer
3. #whereas
4. #trailer
5. #screen
6. #other
7. #minute
8. #projection
9. #languages
10. #refer
11. #usually
12. #attractions
13. #english
14. #coming
15. #preview
16. #movie
17. #definition
18. #teaser
19. #three
20. #minutes