GeoPackage is an open, standards-based, platform-independent, portable, self-describing, and compact format for transferring geospatial information. It is defined by the Open Geospatial Consortium (OGC). A GeoPackage file is a SQLite database file that contains geospatial data. This data can be vector features, tile matrix sets of imagery and raster maps, or non-spatial attributes. GeoPackage is designed to be a single file container, making it easy to share and distribute geospatial data. It supports both vector and raster data, and it can store metadata about the data, such as coordinate reference systems and data quality information. GeoPackage is widely used in GIS applications, mobile mapping, and data exchange. It's particularly useful in situations where data needs to be accessed offline or in environments with limited network connectivity. The format is designed for interoperability and is supported by a wide range of GIS software and libraries.