What do herders and fishermen mean?

Herdsmen: a kind of occupation of people. In the late primitive society, due to the development of productivity, some people began to raise livestock for a living instead of hunting, gathering or farming. Later, people who lived by this profession were called herders. Their mode of production is grazing, raising some cattle and sheep, raising them from small to large, and then selling them to people in need.

Fisherman: It's also a human occupation. Unlike herders, fishermen make a living by fishing and selling fish. They usually live by the sea or by the lake, which is good for them to fish. After catching it, some will keep it for themselves, but most of them will be sold to people in need to get paid.