What is the reason for dancing at a wedding

Part of the mitzva of “making the groom and bride happy” is to entertain them with dancing. By dancing around the bride and groom, the community expresses its support for the couple. The Talmud relates many instances when the greatest of our Sages set aside their uninterrupted study of Torah for the sake of entertaining the couple. In accordance with Jewish law, men and women dance separately with a mechitza (divider) separating them.