What is SD vs HD video?

Related questions

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2. Which is better HD or SD?
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4. What is better HD or 1080p?
5. Is 1920x1080 resolution good?
6. Which is better 1440p or 1080p?
7. Does 1080p matter on a 32 inch TV?
8. Is 1080p better than 720?
9. Can the human eye see the difference between 1080p and 4k?
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Tags

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2. #equate
3. #video
4. #videos
5. #higher
6. #significant
7. #better
8. #resolution
9. #sometimes
10. #1080p
11. #called
12. #about
13. #quality
14. #numbers
15. #standard
16. #referred
17. #definition
18. #generally