What is the importance of a pig?

Pigs or hogs are used for food. Bacon,porkchops, sausage, pork ribs, lard, Hot Dogs.

Answer:

Pigs change low quality organics which people cannot eat into high quality protein that they can eat. They can do this by scavenging the land for edibles or by serving as garbage disposals for the farm.

In modern societies pigs provide other products for human use (besides food and leather) which include insulin.