Coordinate System Differences – Geographic vs Projected Coordinate Systems Explanation

Question

What is the difference between a geographic coordinate system and a projected coordinate system?

Answer 1

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Geographic Coordinate Systems:

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/What_are_geographic_coordinate_systems/003r00000006000000/

Projected Coordinate Systems:

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/What_are_projected_coordinate_systems/003r0000000p000000/