[Proj] difference between EPSG:4326 and Plate Carree?

[sthnew]

 Hi all,

I just subscribed the mailing list and am relatively new to projection
terms...

To my knowledge, EPSG:4326 is generally "unprojected": lat/long as X/Y
coordinates. So:

1. what's the difference between the map in EPSG4326 and the one in
Equidistant Cylindrical projection (+proj=eqc)?

2. Plate Carree is only one type within equiditant cylindrical
projection,right? How to tell their difference?

Thanks so much!

Ying
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