Mahr is a mandatory gift that a groom gives to his bride in Islamic marriages. It symbolizes respect and commitment, and its amount can vary based on cultural practices and personal agreements. The Quran encourages this practice, emphasizing the importance of treating women with dignity. The mahr can be in the form of money, jewelry, or other valuable items, and it is typically agreed upon before the marriage ceremony. This gift is meant to provide financial security for the bride and is hers to keep, even in the event of divorce.