D.O.P. stands for the Italian phrase "Denominazion di Origine Protetta" which translates to a "Protected Designation of Origin". It is essentially the Italian government mandated certification that proves an Italian food or wine product has been grown in a specific place while meeting specific requirements. Some examples of D.O.P. certified products include Parmigiano Reggiano, Balsamic Vinegar of Modena and San Marzano tomatoes.