In order to understand nuclear fusion, think about all of the tiny particles that make up everything around us, called atoms. In the center of each atom, there is a dense center called a nucleus. When an atom's nucleus combines with another, a huge amount of energy is made! It is called ''fusion'' because they are being fused together. 
Nuclear fusion happens when the nucleus of two atoms fuse together.
Nuclear energy is created as a result of fusion. This type of energy is a source of power that could be used to make electricity, though we haven't found a way to do that yet.
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