Geography Markup Language (GML) is an XML-based encoding standard used to represent geographic features and their attributes. It allows for the exchange of spatial data between different systems and applications, making it easier to share and integrate geographic information. GML is widely used in various fields, including geographic information systems (GIS), urban planning, and environmental management. By providing a standardized way to describe geographic data, GML helps ensure consistency and interoperability among different software and platforms that handle spatial information.