SAP R/3 Mainaly dived into 3 layers. 1.Presentation layer. 2.Application layer. 3.Database layer. Presentation layer:- It is used to communicate/connecting with only application server. Here we using the GUI. This GUI is mainly dived into 3 types. (i).Windows GUI. (ii).JAVA GUI. (iii).Html GUI.
Application server is where the dispatcher distribute the work load to the different work processes(like Dailog wp,B/G wp,spool wp, update wp and enque wp )and makes the job done.
Database Server is where it contains three buffer( D/B buffer,SQL buffer and Redolog buffer )and a Actual data base where the commited data is stored. Source: CoolInterview.com
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