What is website overlay?

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Tags

1. #content
2. #obscuring
3. #commonly
4. #popups
5. #increase
6. #graphical
7. #websites
8. #lightboxes
9. #website
10. #windows
11. #overlay
12. #dialog
13. #modal
14. #boxes
15. #correctly
16. #middle
17. #conversions
18. #powerful
19. #referred
20. #appears
21. #overlays
22. #background