The primary goal of PLATO (PLAnetary Transits and Oscillations of stars) is to open a new way in exoplanetary science by detecting terrestrial exoplanets and characterising their bulk properties, including planets in the habitable zone of Sun-like stars. PLATO will provide the key information (planet radii, mean densities, stellar irradiation, and architecture of planetary systems) needed to determine the habitability of these unexpectedly diverse new worlds. PLATO will answer the profound and captivating question: how common are worlds like ours and are they suitable for the development of life?
