  With the launch of ESA's INTEGRAL satellite in october 2002, a gamma-ray
observatory will be placed in orbit providing a multiwavelength coverage from a
few keV up to 10 MeV for the study of high energy phenomena in the universe.
Among the major scientific objectives of INTEGRAL are the study of compact
objects, and in particular of microquasars, stellar nucleosynthesis, high
energy transients, particle acceleration and interaction processes, and
galactic diffuse emission. In this review I will expose the science prospects
of INTEGRAL in the above mentioned fields.
