Pasta sauce ingredients vary quite dramatically from region to region and there is an obvious difference between north and south. In the north, sauces are traditionally richer and often contain red meat e.g. ragù or as it's sometimes known bolognese. As you head south sauces tend to contain more vegetables and on the coast lots of seafood.
Freshly grated cheese is used to top most pasta dishes. Common types include parmigiano, grana padano, pecorino and ricotta salata. The type of cheese used also varies between regions.