DDS_DATAELEMENT is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Data Element" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_DDS_DATAELEMENT TYPE DDS_DATAELEMENT.
The DDS_DATAELEMENT table consists of various fields, each holding specific information or linking keys about Data Element data available in SAP. These include TYPENAME (Name of Dictionary Type), DOMNAME (Domain name), AS4USER (Last Changed by), AS4DATE (Date of Last Change)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .