Why is this night different from all other nights?
Ask the kids! Or better yet, let the kids ask you.
It might surprise you to know that Passover, more than any other Jewish holiday, is focused on the children. The retelling of the story of the Exodus from Egypt to the next generation is actually a Biblical commandment. “And you shall tell it to your child on that day saying: ‘This is done because of that which God did for me when I went out of Egypt'” (Exodus 13:8).
The essence of the commandment to retell the story of the Exodus is fulfilled by educating the children. The method for doing so is set out in the Talmud and is built into the framework of the Haggadah itself (thus the Four Questions about eating matzah and bitter herbs, dipping vegetables and reclining, as well as other special Passover Seder rituals, are included in order to inspire the children's curiosity).
One of the best known and most interesting sections of the Haggadah is the section concerning the Four Children: the wise child, the wicked child, the simple child and the child who does not even know how to ask. This section helps us understand that at the seder, we must all view what is going on as if through children's eyes: with awe, wonder and, most importantly, with questions. The Haggadah thus provides four questions, the Mah Nishtanah, with which to begin!