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In most of Europe, Parmesan cheese is referred to by its Italian name: Parmigiano-Reggiano, a reference to the regions in which the cheese is produced. To bear the Parmigiano label, thecheese must be made from cow's milk between May and November in Modena, Parma, Reggio Emilia, or parts of Bologna and Mantova. The cheese is traditionally made by mixing whole morning milk with skimmed milk from the previous evening. The milk is heated and mixed with rennet to form curds, which are pressed in a cheese mold. True Parmesan is molded with a stencil, indicating where and when it was made. The cheese is soaked in a brine bath and then aged for a minimum of two years before being graded for sale. http://www.wisegeek.org/what-is-parmesan-cheese.htm

Grana Padano is a mild, crumbly cheese made from cow's milk. It originates in Italy, where it was first made by Cistercian monks from an abbey near Milan. It is similar to Parmesan cheese, and is used in many of the same ways.

Read more: What Is Grana Padano Cheese? | eHow.com http://www.ehow.com/about_5085489_grana-padano-cheese.html#ixzz2SBeVRWdc

parmesan is italian and goes good on pizza and spaghetti. grana pandano is crumbly and goes good on something on salad