SAP stores all data in the form of tables in abap dictionary.This is a vital ,individual and edicated data base for SAP.

Here you can learn every thing regarding ABAP DICTIONARY.

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ABAP DICTIONARY OVER VIEW

TABLE TYPES IN ABAP

CHANGES TO DATA BASE TABLES

VIEWS IN ABAP

TYPES OF VIEWS IN ABAP

DATA BASE DIALOG

ABAP DATA BASE UPDATE

ORGANIZING DATA BASE UPDATES

SAP LOCK CONCEPT

SEARCH HELP

DEPENDENCIES OF DICTIONARY OBJECTS

PERFORMANCE DURING TABLE ACCESS

ENHANCEMENTS TO DICTIONARY ELEMENTS

If you are interested in SAP ABAP syntax for format check here.