On the Internet, a walled garden is an environment that controls the user's access to Web content and services. In effect, the walled garden directs the user's navigation within particular areas, to allow access to a selection of material, or prevent access to other material. An Internet service provider (ISP) may or may not allow users to select some of the Web sites contained or barred from the garden. Although the walled garden does not actually prevent users from navigating outside the walls, it makes it more difficult than staying within the environment.