A "red-light district" is a neighborhood or area of a city that is known for sex-oriented businesses, including legal and illegal prostitution. These areas are often associated with a variety of other businesses, such as sex shops, strip clubs, and bars. While the term has historical origins and specific etymologies, it is now used globally to identify these zones. The Amsterdam Red Light District is a prominent example, featuring legal and regulated prostitution alongside other businesses in its historic canals.  

• Associated businesses: 

  These districts typically have a high concentration of sex shops, strip clubs, peep shows, and adult theaters. 

• Legal status: 

  The legal status of prostitution varies by location. In some places, it is legal and regulated, while in others it is illegal. For example, Amsterdam has legalized and regulated prostitution, leading to a regulated industry with workers paying taxes. 

• Amsterdam example: 

  The Red Light District in Amsterdam is one of the most famous examples. It is a historic area with canals where sex workers operate legally from windows, and the area also features other attractions like museums, cafes, and coffee shops. 

• History and etymology: 

  The term "red-light district" has various potential origins. One folk etymology for Amsterdam suggests red lanterns were used to guide sailors to brothels, while another theory connects it to the color red symbolizing the sex trade. In Japan, "red-line" maps were used to designate areas for legal prostitution, which is where the term "red line" comes from. 

• Definition: 

  A red-light district is a commercial and residential area where prostitution is a key feature.