Mistakenly, there are those who confuse the terms and confirm that in Islam there is polygamy when in fact what there is is polynigy, so it is important to clarify that:
Polygamy: man or woman who has multiple spouses.
Polyandry: A woman who has multiple men.
Polygyny: the man who has multiple wives.
Polygyny is not a religious obligation, but a permission given by God, and it is up to men use yo use this permission wisely.
Muslims are often accused of being promiscuous because polygyny is legal in Islam.