Full Form of SAP "R/3"

As we know, when we say u201CSAP R/3u201D, "R" stands for "Real-time data processing" and u201C3u201D for 3-tier.
Can someone explain in simple language what this 3-tier architecture is? Also, what is the difference between two-tier and three-tier architectures and why one (3-tier) is a better choice for SAP than the other?

welcome in 2011!
SAP R/3 has been replaced by its successor in 2003. Hope you don't have to work on such a rather old system.
May I suggest to use the 3-tier architecture of http://www.google.com as a start to learn what an n-tier architecture is?
have fun,
anton
Edited by: Anton Wenzelhuemer on Jan 25, 2011 1:28 PM

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