The Four Questions, or Mah Nishtanah, are traditionally sung by the youngest person at the Passover Seder, highlighting why that night is different from all others. They focus on eating only matzah, consuming bitter herbs, dipping foods twice, and reclining, all to trigger the retelling of the Exodus story. Reform Judaism.org 

The Four Questions (Mah Nishtanah):

1. Matzah: On all other nights, we eat chametz (leavened bread) and matzah, but on this night, why only matzah?
2. Maror (Bitter Herbs): On all other nights, we eat all kinds of vegetables, but on this night, why only bitter herbs?
3. Dipping: On all other nights, we don’t dip our food even once, but on this night, why do we dip twice?
4. Reclining: On all other nights, we eat sitting or reclining, but on this night, why do we all recline? Reform Judaism.org 

The purpose of these questions is to encourage engagement and educate the next generation about the story of Passover. They arise from the Mishna and represent a key interactive moment of the Seder Wikipedia.