How do I make an image responsive in HTML?

Related questions

1. What is fully responsive design?
2. What is IMG tag?
3. What is BFC CSS?
4. What is normalizing CSS?
5. Is IMG self closing?
6. What is a responsive image?
7. Is Google a dynamic website?
8. Are iFrames deprecated?
9. What is example of dynamic?
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Tags

1. #style
2. #browser
3. #using
4. #format
5. #property
6. #small
7. #attribute
8. #responsive
9. #width
10. #inline
11. #commonly
12. #value
13. #works
14. #sideways
15. #image
16. #application