Feta is a traditional Greek cheese granted Protected Designation of Origin (PDO) status by the European Union in 2002. This designation ensures that only cheese produced in specific regions of Greece, using traditional methods and primarily sheep's milk (with up to 30% goat's milk), can be labeled as 'Feta'. The PDO status protects the authenticity and quality of this iconic cheese, which is known for its salty and slightly acidic flavor.