For definitions of GIS and ESRI software-specific terminology, see the GIS Dictionary. This glossary contains terms specific to ArcGIS Online.
In the context of ArcGIS Online, content is maps, layers, and tools.
A layer package is a special file (layer_name.lpk) that contains a layer, a copy of the data, and an XML file that has a brief description of the layer. It can be opened in ArcGIS Desktop 9.3.1 and ArcGIS Explorer 900 using an automatic unpacking process (called a file handler). Layer packages are created in ArcMap 9.3.1 or ArcGlobe 9.3.1.
An item is a map, layer, or tool that you find, use, or add to ArcGIS Online. It is synonymous with content.
ArcGIS Online groups are a way to collaborate with other ArcGIS users. You join and create groups to exchange content related to a specific project or common activity.
An ArcGIS user who has registered for ArcGIS Online. Members can also belong to groups.
Status messages about your group membership requests.
The person responsible for creating and managing an item of content or a group. The owner determines who has access to the content or group.
A Web based, interactive map created with ArcGIS Online that allows you to display and query the layers on the map. An ArcGIS Online Web map contains one or more ArcGIS Server map services that are referenced to ArcGIS Online.