GCS_WGS_1984 Coordinate system

Discussion created by jorgebraque on Oct 12, 2012
Latest reply on Oct 12, 2012 by jorgebraque
Hello friends,
Ok I am a little confused. I downloaded some shp files of the world (countries, rivers, cities...). The coordinate system is GCS_WGS_1984. So is there any projection that i should mention in the layout of the map? Also on my screen  i see 2D shapes not a 3D sphere so what means using a Geographic coordinate system in ArcMap?
Thank you in advance.