  Emission of particles created in the background of a rotating black hole can
be greatly amplified taking away rotational energy of a black hole. This
amplification affects both particles created near the horizon (due to the
Hawing effect), and particles created near the potential barrier far from the
horizon. Only the latter effect is called the superradiance in the strict
sense. We explicitly calculate the superradiant emission for scalar particles
and compare it with the total scalar particle emission (Hawking radiation plus
superradiance) to clarify some confusion in the literature. We clearly show
that these two emissions are not the same. In particular, superradiance
persists even for extremal black holes whose Hawking temperature is zero.
