SAP R/3 - Systems Applications and Products in 3 Tier Architecture.
Typical structure of an R/3 system is as below
Presentation Layer
Application Layer
Database Layer
Presentation Layer is nothing but the system/pc we/end user accesses to perform the activity
Application layer will receives the request from user(i.e, presentation layer) and performs the activity based on the request.
Database Layer is nothing but Database. when an activity is running in application layer and that particular activity needs some data than a request will come to Database layer,Database layer sends back the data.
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