What makes D.O.P. Parmigiano-Reggiano different from other parmesans?

[alexalbon23]

I've heard a lot about D.O.P. (Denominazione di Origine Protetta) Parmigiano-Reggiano and how it's supposed to be superior. What exactly sets it apart from other parmesan cheeses? Is it worth the higher price tag?

 

[patotya]

Flavor and Texture: D.O.P. Parmigiano-Reggiano has a rich, nutty, and savory flavor with a granular texture that's hard to replicate. It’s perfect for grating over dishes, adding depth and umami.