What is the purpose of overhead projector?

Related questions

1. Which mirror is used in projector?
2. What makes a good projector?
3. What is an Epidiascope projector?
4. What is the difference between LCD projector and overhead projector?
5. How does an LCD screen work?
6. How many types of projectors are there?
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Tags

1. #screen
2. #below
3. #large
4. #glass
5. #sheet
6. #projector
7. #images
8. #overhead
9. #system
10. #writing
11. #something
12. #light
13. #placed
14. #modern
15. #audience
16. #plate
17. #projectors
18. #purpose
19. #clear
20. #showing
21. #basically
22. #plastic
23. #piece