This plugin brings in the ability to read and write GeoPackage files in GeoServer. GeoPackage is an SQLite based standard format that is able to hold multiple vector and raster data layers in a single file.
GeoPackage files can be used both as Vector Data Stores as well as Raster Data Stores (so that both kinds of layers can published).
GeoPackage can be used as an output format for WFS GetFeature (creating one vector data layer) as well as WMS GetMap (creating one raster data layer). The GeoServer GeoPackage extension also allows to create a completely custom made GeoPackage with multiple layers, using the GeoPackage process.