Ravioli are a type of pasta comprising a filling enveloped in thin pasta dough. Usually served in broth or with a sauce, they originated as a traditional food in Italian cuisine. Ravioli are commonly square, though other forms are also used, including circular and semi-circular (mezzelune).

The word 'ravioli' means "little turnips" in Italian dialect, from the Italian 'rava' meaning turnips, from the Latin 'rapa'.

Traditionally, ravioli are made at home. The filling varies according to the area where they are prepared. In Rome and Latium the filling is made with ricotta cheese, spinach, nutmeg and black pepper. In Sardinia, ravioli are filled with ricotta and grated lemon rind.

Modern ravioli are also mass-produced by machine.

More Info: en.wikipedia.org