Amusement park is the generic term for a collection of ries and other entertainment attractions assembled for the purpose of entertaining a large group of people. An amusement park is more elaborate than a simple city park or playground, usually providing attractions meant to cater to adults, teenagers, and small children. A theme park is a type of amusement park which has been built around one or more themes, such as an American West theme, or Atlantis. Today, the terms amusement parks and theme parks are often used interchangeably.