The earliest attempts at fusion reactor design used magnetic confinement to compress the fuel plasma as well as keep it away from the reaction vessel walls. The best such designs were derived from the Russian tokamak toroidal reactors.
Newer attempts use inertial confinement (like H-bomb secondaries) and have come much closer to break-even than tokamak types have. No magnetic fields are used here.
Nuclear fusion is a nuclear reaction, but so is fission. So not all nuclear reactions are fission.
The stars produce their heat from nuclear fusion reactions. Work on earth to produce controllable nuclear fusion is concentrating on one particular reaction, between deuterium and tritium, because it is the easiest to get going (though hard enough!). Stars operate with other reactions but all of the nuclear fusion type. You can read more in Wikipedia 'Nuclear fusion'
Nuclear reactions convert very small amounts of matter into significant amounts of energy.
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Reactions that involve nuclei, called nuclear reactions, result in a tremendous amount of energy. Two types are fission and fusion.
nuclear fission and nuclear fusion
Fusion and fission nuclear reactions.
Nuclear fusion
You probably mean nuclear fusion
Fission and fusion are different nuclear reactions.
Nuclear fusion is a nuclear reaction, but so is fission. So not all nuclear reactions are fission.
There are four types of nuclear reactions. Fusion Fission Radioactive Decay Artificial Transmutation
Nuclear energy is obtained through fission and fusion reactions.
The stars produce their heat from nuclear fusion reactions. Work on earth to produce controllable nuclear fusion is concentrating on one particular reaction, between deuterium and tritium, because it is the easiest to get going (though hard enough!). Stars operate with other reactions but all of the nuclear fusion type. You can read more in Wikipedia 'Nuclear fusion'
The sun's nuclear reactions are fusion reactions at extremely high temperatures and pressures, while the nuclear reactor's nuclear reactions are fission reactions at typical temperatures and pressures for earth.
Uncontrolled nuclear fusion reactions.
Nuclear reactions convert very small amounts of matter into significant amounts of energy.