ABAP (Advanced Business Application Programming), is a fourth-generation programming language, used for development and customization purposes in the SAP software. Currently positioned along with Java, as the main language for SAP application server programming, most of the programs are executed under the control of the run-time system. This tutorial explains the key concepts of SAP ABAP.

BAP stands for Advanced Business Application Programming, a 4GL (4th generation) language. Currently it is positioned, along with Java, as the main language for SAP application server programming.

Let's start with the high level architecture of SAP system. The 3-tier Client/Server architecture of a typical SAP system is depicted as follows.

The Presentation layer consists of any input device that can be used to control SAP system. This could be a web browser, a mobile device and so on. All the central processing takes place in Application server. The Application server is not just one system in itself, but it can be multiple instances of the processing system. The server communicates with the Database layer that is usually kept on a separate server, mainly for performance reasons and also for security. Communication happens between each layer of the system, from the Presentation layer to the Database and then back up the chain.

sap abap concepts:

1. data dictionary

2. reports

3. screen programming

4. bdc ( batch data communication )

5. Lsmw

6. ENHANCEMENTS

7. bapi

8. scripts

9. smartforms

10. ale/idocs

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