WKT, or Well-Known Text, is a text markup language used for representing geometric objects on a map. It provides a simple way to describe shapes like points, lines, and polygons in a format that can be easily read and understood by both humans and computers. WKT is commonly used in geographic information systems (GIS) and spatial databases to store and exchange geometric data. By using a standardized format, WKT allows different software applications to share and interpret spatial information consistently, facilitating tasks like mapping and spatial analysis.