Polygyny (sometimes referred to as polygamy), meaning having more than one wife, is a traditional practice amongst some ethnic groups in South Africa, such as the Zulu and the Xhosa. It's more common in rural, rather than urban, areas, and is still regarded by many as an important part of their culture.
Although the practice has been going on for many years, it was thrust into the headlines in 2010 when the new President of South Africa, Jacob Zuma, married his third wife in a traditional ceremony.
Polygamy is by no means a South Afican phenomenom, and is practised in many other areas of the world. However, it is interesting to note that the female equivalent of polygyny, polyandry (where a woman takes more than one husband) is a lot less common-place!