It is the set of attributes of the material, which you left for you to add to what suits your business and your needs instead of the program imposing on you descriptors that you are indispensable, and these descriptors can be used and filtered on them in reports, and descriptors such as (the importing company, the producing company, the country of origin … etc).
The material descriptors card is accessed from the "Stock - Cards - Material Descriptors Card"