The four questions are recited during the Passover Seder by the youngest member at the table. They can be sung in Hebrew or read in Hebrew or English. Many families will sing the questions together with the youngest member.
Another name for the four questions is "Mah Nish-tah-nah."
In English, the questions asked are:
Why is this night different from all other nights?
1) Why do we only eat Matzah on Passover?
2)Why do we eat Maror or Bitter Herbs on this night?
3) Why is the Karpas or Green Vegetable dipped twice on this night?
4)Why do we lean on a pillow at the Passover Seder?