As far as I understand the EGM96 defines the Geoid, where as the WGS84 Standard defines the Ellipsoid.
Is the ellipsoid defined in the WGS84 standard defined in a way to maximize the congruency with the the geoid defined in the EGM96 standard?
Answer
a quick google of the two will lead you to http://en.wikipedia.org/wiki/World_Geodetic_System
From that page: Updates and new standards The latest major revision of WGS 84 is also referred to as "Earth Gravitational Model 1996" (EGM96), first published in 1996, with revisions as recent as 2004. This model has the same reference ellipsoid as WGS 84, but has a higher-fidelity geoid (roughly 100 km resolution versus 200 km for the original WGS 84).
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