MCVOBJECT 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 "Characteristics that are not filled by the application" 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_MCVOBJECT TYPE MCVOBJECT.
The MCVOBJECT table consists of various fields, each holding specific information or linking keys about Characteristics that are not filled by the application data available in SAP. These include ATINN (Internal characteristic), ATWRT (Characteristic Value), KLART (Class Type), KONOB (Product allocation object)... 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. .