What is transition in css3 explain with syntax?

Related questions

1. What is an example of transition?
2. What is a good transition sentence?
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4. What is CSS Webkit?
5. Is but a transitional device?
6. How are CSS files saved?
7. How do you punctuate transition words?
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9. What can I say instead of so?
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Tags

1. #transition
2. #transitions
3. #element
4. #smoothly
5. #below
6. #mouse
7. #given
8. #allows
9. #change
10. #example
11. #duration
12. #property
13. #value
14. #values
15. #another
16. #effect