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What is the difference: Coordinate System v.s. Spatial Reference?

Question asked by huangs3 on Mar 26, 2013
Latest reply on Mar 27, 2013 by gprince-esristaff
Hi Everybody:

    I am trying to create a script that takes coordinate system as an input, but after checking the list of data types I found that both Spatial Reference and Coordinate System types are suitable (see attached picture). Which should I use? or what are the difference between them?
    Thank you!