Polyandry is a specific form of polygamy in which a woman has more than one husband at the same time. This type of marriage is less common than polygyny (where a man has multiple wives) and is found in certain cultures around the world, often associated with specific economic or social conditions, such as limited land resources or the need to maintain family size in challenging environments. Different forms of polyandry exist, including fraternal polyandry, where a woman marries a group of brothers.