You are right. A cloned animal or plant is an exact genetic duplicate of a single individual obtained without breeding. Some GMOs are also clones, but so are some non-GMOs. Grafting apple trees is a form of cloning, and without it we would not be able to propagate most types of apples.
Cloning animals is more complex, since we have to mimic the process of egg fertilization in order to have the resulting animal develop properly. The process of normal egg fertilization with sperm activates certain mechanisms in the egg that are still not fully understood; one of the reasons why cloning animals is still not a very efficient procedure.
The concern about using cloning is that if not controlled carefully you will end up with same problems that occur through inbreeding of purebred animals. Genetic diversity and mixing of genes through normal breeding is what ensures that animals can survive through the generations. Just look at the physical problems that can associated with some purebred breeds of horses, dogs and other animals where most of the breed can be traced back to only a handful of founder animals. Eventually the lack of genetic diversity leads to problems. Cloning will just accelerate this process.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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