Some data providers make their spatial data available as services that can be added to your maps.  The functionality of these services varies and can range from simple mapping to analysis or even exporting.  The service provider determines what functions are available and how users may interact with their datasets.  To add these services to ArcMap, see "Adding a web service from a GIS Server" in this guide.

Some examples of these types of services are:

• St. Louis City (https://stlgis.stlouis-mo.gov/arcgis/rest/services)
  The view-only services in the Public collection include building footprints and parcel boundaries.
• Missouri Spatial Data Information Service (see this page for details)
  This Missouri clearinghouse for geospatial data has an extensive collection of services including aerial imagery and vector features.