MSIT_MATDESC 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 "Material Master Descriptions - Datatype" 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_MSIT_MATDESC TYPE MSIT_MATDESC.
The MSIT_MATDESC table consists of various fields, each holding specific information or linking keys about Material Master Descriptions - Datatype data available in SAP. These include FUNCTION (Function of BAPI), MATERIAL (Material Number), LANGU (Language Key), LANGU_ISO (2-Character SAP Language Code)... 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. .