original_query: What is the purpose of a Certificate of Origin or Declaration of Origin?
query: What is the purpose of a Certificate of Origin or Declaration of Origin?
answer: A Certificate of Origin (C/O) or Declaration of Origin (DOO) attests that a product meets criteria to be considered as originating in a particular country.  It's used in international trade to justify a product's eligibility for entry and/or preferential treatment in the importing country.