AMS is a particle physics experiment in space. During at least 3 year operation on the International Space Station, the AMS-02 detector will provide atmospheric background-free data on fluxes and composition of the Galactic Cosmic Rays with unprecedented precision. The searches for the exotic components of the Cosmic radiation such as primordial antimatter or dark matter signals will also be performed. The new results will allow to improve the knowledge of the Cosmic Ray production, acceleration and propagation mechanisms, and to constrain various models.