Why do we use media queries?

Related questions

1. What is PX photo?
2. What is an em?
3. What Is REM bootstrap 4?
4. What is the new in bootstrap 4?
5. Which is better px or em?
6. Should I use em for padding?
7. What is EM in CSS style?
8. How many points is a pixel?
9. What is the use of EM in CSS?
10. What is difference between REM and PX?

Tags

1. #range
2. #those
3. #effective
4. #height
5. #devices
6. #width
7. #commonly
8. #content
9. #viewport
10. #container
11. #media
12. #within
13. #simple
14. #because
15. #queries
16. #different
17. #serve
18. #styles
19. #depend