What does flatten a PDF mean?

Related questions

1. Why do PDFs take so long to print?
2. How do you flatten transparency in PDF?
3. Does PNG allow transparency?
4. Does PDF have transparency?
5. How do I remove the white background from a PDF?
6. What is flatten transparency?
7. What file formats support transparent background?
8. Can you make a PDF transparent?
9. What does flattening a PDF do?
10. What is PDF transparency?

Tags

1. #process
2. #files
3. #actual
4. #interactive
5. #boxes
6. #separate
7. #forms
8. #removing
9. #adding
10. #stream
11. #shapes
12. #flattening
13. #include
14. #checkboxes
15. #radio
16. #images
17. #buttons
18. #lists