A queen consort is the wife of a reigning king, and usually shares her spouse's social rank and status. She holds the feminine equivalent of the king's monarchical titles and may be crowned and anointed, but historically she does not formally share the king's political and military powers, unless on occasion acting as regent.
In contrast, a queen regnant is a female monarch who rules suo jure and usually becomes queen by inheriting the throne upon the death of the previous monarch.
A queen dowager is a widowed queen consort, and a queen mother is a queen dowager who is the mother of the current monarch.
When a title other than king is held by the sovereign, his wife can be referred to by the feminine equivalent, such as princess consort or empress consort.
In monarchies where polygamy has been practised in the past (such as Morocco and Thailand), or is practised today (such as the Zulu nation and the various Yoruba polities), the number of wives of the king varies. In Morocco, King Mohammed VI has broken with tradition and given his wife, Lalla Salma, the title of princess. Prior to the reign of King Mohammed VI, the Moroccan monarchy had no such title. In Thailand, the king and queen must both be of royal descent. The king's other consorts are accorded royal titles that confer status. Other cultures maintain different traditions on queenly status. A Zulu chieftain designates one of his wives as "Great Wife", which would be the equivalent to queen consort.
Conversely, in Yorubaland, all of a chief's consorts are essentially of equal rank. Although one of their number, usually the one who has been married to the chief for the longest time, may be given a chieftaincy of her own to highlight her relatively higher status when compared to the other wives, she does not share her husband's ritual power as a chieftain. When a woman is to be vested with an authority similar to that of the chief, she is usually a lady courtier in his service who is not married to him, but who is expected to lead his female subjects on his behalf.