1 [ESRI software] An element in the Catalog tree. Items include data sources, such as shapefiles and geodatabases, and nonspatial elements, such as folders.
2 [ESRI software] In coverages, a field or attribute.
3 [ESRI software] A column of information in an INFO table.
4 [Internet] In ArcGIS Online, a map, layer, or tool that you find, use, or add to ArcGIS Online.