| Summary: | In this chapter a general framework of the Magnetohydrodynamics (MHD) is described,
beginning from the two branches from where the MHD is developed: the
hydrodynamics, with the Navier-Stokes equation and the classical electromagnetism,
adapted to the problem here described: a conducting, charge-free and
non-magnetizable fluid. The four equations used are obtained (Navier-Stokes,
Induction and Gauss equations), and the dynamo effect is explained. A brief explanation
of the mean-field theory and some anti-dynamo theorems are given.
Finally, an overlook of the numerical and experimental work is given, with an
emphasis on the von K´arm´an experiments.
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