What is the difference between 'meat' and 'mutton'?

Meat could be any edible flesh of animals. Mutton is the meat of sheep, goat, lamb.

 While the meat of big cows, buffalos is called 'beef'and the meat of a young calf is called 'veal'. The meat of deer/stag is called, 'venison'. Of course, the meat of a pig is called 'pork' whereas Ham includes both whole cuts of fatty meat of a pig cut from the thigh or rump of the pig. Bacon (which forms breakfast of several) is the meat taken from the back, loin or belly of the pig.