The city centre is the (often historical) area of a city where commerce, entertainment, shopping, and political power are concentrated. The term is commonly used in many English-speaking countries and has direct equivalents in many other languages. However, noticeably, in the United States, the term "downtown" is commonly used to denote a city centre, and in Canada the terms "city centre" and "downtown" are used interchangeably. In Australia, the term "Central Business District" is widely used to refer to the city centre, but usage of the term "City Centre" is increasing, especially in Melbourne. In South Africa, "CBD" is used in formal contexts, but in informal contexts, the city centre is referred to as "town", and despite the growth of decentralised CBDs such as Sandton and Umhlanga "town" continues to refer to the original CBDs of cities.