  Numerous aspects and mechanisms of color confinement in QCD are surveyed.
After a gauge-invariant definition of order parameters, the phenomenon is
formulated in the language of field correlators, to select a particular
correlator responsible for confinement. In terms of effective Lagrangians
confinement is viewed upon as a dual Meissner effect and a quantitative
correspondence is established via the popular abelian projection method, which
is explained in detail. To determine the field configurations possibly
responsible for confinement, the search is made among the classical solutions,
and selection criterium is introduced.
