Do 12v LEDs need resistors?

Related questions

1. Do LED light strips get hot?
2. Can you leave LED strip lights on all night?
3. What color is an anode?
4. Does RGB make white?
5. How a single LED emits different Colours?
6. Is lead or led correct?
7. What is the voltage required for an LED?
8. What causes the difference in color between LEDs?
9. Does every LED need a resistor?
10. Are led and lead interchangeable?

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13. #current
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18. #resistor