GeoJSON is a geospatial data interchange format based on JavaScript Object Notation (JSON). It defines a JSON format for representing geographic features, their properties, and spatial extents. GeoJSON supports various geometry types including Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection. Features in GeoJSON contain a geometry object and additional properties that describe the feature. A FeatureCollection represents a collection of Feature objects. GeoJSON is widely used for representing geographic data in web applications, mobile apps, and GIS software. It is a lightweight and human-readable format, making it easy to parse and generate. The format is commonly used for storing and exchanging geographic data between different systems and applications. GeoJSON is an open standard and is supported by a wide range of GIS tools and libraries. Its simplicity and widespread adoption make it a popular choice for representing geographic data on the web.