Single-member district is a term used in politics to describe a voting district that elects a single representative. There are several alternative phrases and synonyms for this term, such as single-member constituency, single-seat constituency, and single-member electoral district. Other synonyms include one-member district, individual constituency, one-seat electoral area, and one-member unit. The concept is used in many countries worldwide, with the United States, Canada, and the United Kingdom being among the countries that adopted it. The benefits of single-member districts include a more direct and focused representation of voters' interests, while disadvantages include potential gerrymandering and lack of proportional representation.