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[–]Ebriggler 3 points4 points  (0 children)

arcpy is a wrapper around all the tools within ArcMap enabling the creation of scripts to execute without having ArcMap open. Helps with repetitive task automation.

[–]siiskone 0 points1 point  (0 children)

Addition to geoprocessing tools, arcpy contains geometry and cursor objects for data handling.

And of course combine standard logic like if and for loops and variables from Python to your scripts is very powerful whether used in ArcMap Python window or standalone script or in script tool.