  The INTEGRAL satellite, which studies the Universe in the hard X-ray and soft
Gamma-ray domain, has been operational for 5 years now. The X-ray telescopes,
which use the coded mask technique, provide unprecedented spectral and imaging
resolution. This led to a number of discoveries, such as the distribution of
diffuse emission in the Galaxy, the discovery of highly absorbed sources and
fast X-ray transients in the Galactic Plane, localization of ~50 Gamma-ray
bursts, and the resolution of the cosmic X-ray background around its peak at 30
keV. About 300 previously known X-ray sources have been detected and in
addition more than 200 new sources have been discovered. INTEGRAL provides
spectra starting at 3 keV and ranging up to several hundred keV. This article
gives a brief overview about the major discoveries of INTEGRAL.
