ORDERS 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 "Order structure of marked table entries for order progress" 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_ORDERS TYPE ORDERS.
The ORDERS table consists of various fields, each holding specific information or linking keys about Order structure of marked table entries for order progress data available in SAP. These include AUFNR (Order Number), WERKS (Plant), AUART (Order Type), OBJNR (Object number)... 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. .