According to Catholicism, are "works": (1) keeping the moral law, (2) doing good deeds, or (3) both?

I don't understand what the works that accompany faith are for Catholics to be saved. Are they: 1) Keeping the Moral Law 2) Doing good deeds (i.e. charity work) 3) Both If it is both, what good deeds do we need to do? And how often do we need to do them to remain in a state of grace? (Matthew 25 is concerning).