  The usage of the anthropic principle in modern cosmology is reviewed. It is
argued that its recent use to explain the observedvalues of cosmological
parameters as most probable values for an ensemble of universes, is not
justified. However, the anthropic principle can be invoked to argue that a vast
number of universes must exist, in which the cosmological parameters and
constants of nature take on different values. This argument lends support to
the hypothesis of eternal inflation and suggests that at least some of the
parameters of the Standard Model cannot be quantitatively derived from an
underlying theory.
