Compare and contrast selective breeding and natural selection?
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Pri1003 is entirely correct.
One of the points that bears emphasis here is the fact that "selective breeding" is entirely unique to, and confined, to humans, and is responsible for everything from modern agriculture to the range of size in domesticated dogs.
The process itself, and its results, can be viewed in the link I've attached to a Youtube video on the Russian efforts to domesticate foxes.
In general, I prefer to call selective breeding "artificial breeding" because it clearly establishes that this is not a process driven by nature, but by humans. We might think that animals which breed based on cosmetics, such as bright plumage or staged combat, are participating in selective breeding, but this is referred to specifically as sexual selection. There is some debate over whether humans have become a sexually selective species in modern times. In contrast to artificial selection, however, sexual selection is still considered an aspect of natural selection.
We must also be careful never to assume that the "direction" that humans build into their artificial breeding, such as seeking high-productivity crops or docile animals, is present within natural selection.
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