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Conveying the story of the Exodus in question-answer format carries special value. Posing questions opens the mind and heart to receiving answers. Since the message we need to convey at the Seder is foundational, we are commanded to transmit it in the best possible way.
For the same reason, we are commanded to eat matza and maror (as well as the Paschal offering, when there is a Temple). Having these unusual foods at the Seder makes it clear to the children that this night is unique and piques their interest, which leads them to ask about its significance. To encourage children’s questions, the Sages instituted doing a number of things in unusual ways.
This is also why the Sages formulated Ma Nishtana (the Four Questions) at the beginning of Maggid, in which the children express their surprise at our curious Seder behavior. Their asking these questions prompts the adults to answer by telling them about the Exodus. If no children are present, an adult recites Ma Nishtana. Even an individual alone at the Seder must begin with Ma Nishtana.
