DO YOU KNOW WHAT THE BENEFIT OF OPEN END QUESTION IS ?

First you have to understand what is open end and close end question...
open end question is a question with unlimited answer or opinio...
for example: What makes you so happy? Why are you sitting there? How do I cook better?...
the advantage is you can make a conversation long and get more informations.
Close end question like Yes/ No question...
for example: Did you eat yet? Are you happy with it? Have you try yet?...
the advantage is you can get to the answer right away, simple and easy...