  The present review is devoted to the muon magnetic moment and its role in
supersymmetry phenomenology. Analytical results for the leading supersymmetric
one- and two-loop contributions are provided, numerical examples are given and
the dominant tan(beta)sign(mu)/M_SUSY^2 behaviour is qualitatively explained.
The consequences of the Brookhaven measurement are discussed. The 2 sigma
deviation from the Standard Model prediction implies preferred ranges for
supersymmetry parameters, in particular upper and lower mass bounds.
Correlations with other observables from collider physics and cosmology are
reviewed. We give, wherever possible, an intuitive understanding of each result
before providing a detailed discussion.
