The table category defines whether a physical table exists for the logical table description defined in the ABAP Dictionary and how the table is stored on the database.
Here are the following existing table types:
* Transparent Tables (TRANSP)
There is a physical table on the database for each transparent table. The names of the physical table and the logical table definition in the ABAP/4 Dictionary agree. All the business and application data is stored in transparent tables.
* Structure (INTTAB)
No data records exist on the database for a structure. Structures are used for the interface definition between programs or between screens and programs.