Abstract: I shall briefly present robotics, with images. I shall in particular explain the notions of serial architecture and parallel architecture. Then I shall introduce the central topic of my talk: singularities of parallel robots. I intend to explain why roboticians studying the kinematics of parallel robots are specially interested in cusps. I shall also consider some examples: asymptotic singularities of planar parallel robots, rationality of the set of singular configurations of a Stewart platform.