The following is from Esri's ArcGIS 10.1 help topic titled "A quick tour of geoprocessing packages."
"A geoprocessing package is a convenient way to share geoprocessing workflows by packaging one or more tools and the data used by the tools into a single compressed file (.gpk). All resources (models, scripts, data, layers, and files) needed to reexecute the tools are included in the package. This means consumers of your package can rerun your tools to produce the exact same results. They can analyze your tools to understand how you accomplished your workflow and can substitute their own data for the data provided in the package."
Follow this process to create a geoprocessing package from the model you created in previous steps.
- In ArcMap, click Geoprocessing > Results.
- In the Results pane, right-click your tool and select Share As > Geoprocessing Package.
- In the Geoprocessing Package window, click the Save package to file radio button.
- Name the package and specify its location.
- Click Item Description in the right pane of the Geoprocessing Package window.
- Provide a Summary and Tags.
- Click Analyze at the top of the window.
- Address any errors.
- Click Share.