polygamy is the kind of marriage where one person is married to more than one partner.
There are three popularly known forms of polygamy: polyandry, polygyny, and group marriage.
Polygamy is often confused with the concept of polyamory. To be honest, polyamory is a more accepted form and legal way of being in a relationship these days.
Polygamy is legal in some parts of Asia and the Middle East. There are parts of Africa where polygamy is permitted and is widely practiced, especially in the western part of Africa. In the Islamic doctrine, it is mentioned that a man can have four wives at the max.