What is the purpose of backlight on an LCD screen?

Related questions

1. What's better edge lit or backlit?
2. What is the difference between LCD and LED backlit monitor?
3. Which is better Super Amoled or IPS LCD?
4. Is led better than IPS?
5. How does IPS LCD work?
6. Which consumes more power LED or LCD?
7. Is Direct led better than edge lit?
8. Is led good for gaming?
9. Which display is better TFT or IPS LCD?
10. Should I get a projector or TV?

Tags

1. #produce
2. #conditions
3. #phones
4. #readability
5. #similar
6. #smart
7. #manner
8. #backlights
9. #computer
10. #display
11. #increase
12. #light
13. #televisions
14. #wristwatches
15. #small
16. #displays