  IceCube is the first representative of the km^3 class of neutrino telescopes
and currently the most sensitive detector to high-energy neutrinos. Its main
mission is to search for Galactic and extragalactic sources of high-energy
neutrinos, but it is also an excellent detector for the investigation of a
variety of other highly topical astrophysics and particle physics topics like
supernovae, dark matter and neutrino oscillations. After an introduction to
neutrino astronomy and neutrino telescopes, this article presents a selection
of latest results from the IceCube neutrino detector with respect to searches
for cosmic high-energy neutrino sources.
