f7 is the one square in the starting position that only the king defends, and 3.Bc4 points at it from move three. That is the whole of the opening's reputation, and almost none of its modern practice.
What strong players actually play is slow: d3, c3, a knight from b1 to d2 to f1 to g3, and the d4 break saved until it is properly prepared. The older Giuoco Piano plays c3 and d4 at once and leads to sharper, more forcing chess. Both are the Italian; the difference is whether the centre is opened before or after the pieces are ready.