Thermonuclear fusion is a way to achieve
nuclear fusion by using extremely high temperatures. There are two forms of thermonuclear fusion:
uncontrolled, in which the resulting energy is released in an uncontrolled manner, as it is in
thermonuclear weapons such as the "hydrogen bomb", and
controlled, where the fusion reactions take place in an environment allowing some of the resulting energy to be harnessed for constructive purposes. This article focuses on the latter.