What is 2k resolution and 4k resolution?

Related questions

1. Is there a big difference between 1440p and 1080p?
2. Is 4 megapixels better than 1080p?
3. What's the highest resolution camera?
4. What is Quad HD resolution?
5. Is 1440p twice 1080p?
6. What is HD resolution?
7. Can the iPhone XS play 4k?
8. Does 16k resolution exist?
9. Is 4k noticeable over 1080p?
10. Which is better quality 720p or 480p?

Tags

1. #defines
2. #approximately
3. #content
4. #display
5. #initiatives
6. #standard
7. #horizontal
8. #device
9. #digital
10. #resolution
11. #pixels
12. #cinema