The present generation of Cherenkov telescopes has opened a window in the domain of very high-energy gamma-ray observations. The first detailed observations of the sky at TeV energies have revealed Galactic sources with complex and resolved structures as well as numerous extragalactic sources. The scientists cooperating within the Cherenkov Telescope Array Consortium and the shareholders and associate members of the Cherenkov Telescope Array Observatory have the ambition to provide the science community with a worldwide unique and technically innovative Atmospheric Cherenkov Telescope Observatory (CTA). With its largely improved sensitivity and spatial resolution, CTA will serve a wide astrophysics community, it will provide a deep insight into the non-thermal high-energy universe and will enable scientists to tackle a variety of fundamental open questions. The mission of the CTAO is to prepare the design, implementation and construction of the Cherenkov Telescope Array.