A red-light district is an area in a city where various adult services, such as prostitution and adult entertainment, are legally or socially accepted. These districts often feature numerous establishments like bars, clubs, and brothels, catering to adult clientele. The term "red-light" originates from the practice of using red lights to indicate the presence of such services. Typically found in urban areas, red-light districts can vary in size and reputation. Some are well-known tourist attractions, while others may be associated with crime and social issues. Cities like Amsterdam and Bangkok are famous for their red-light districts, which draw visitors seeking unique experiences.