Euclid space mission of ESA is finally a reality, it is now out in space ready to observe the entire extra-galactic sky in the optical and in the infrared with exquisite resolution, depth and total observed area. The Euclid data set will be the deepest and widest source of extra-galactic information ever created and for such an amount of data ESA had to expand and improve the entire network of ground antennas to stand this unprecedented data transfer. With this unique tool, we will provide exquisite measures of weak-gravitational lensing, the 3D correlation function of galaxies, a huge sample of strong lenses for cosmography studies, the widest and broadest sample of galaxy clusters to probe cosmic structure formation and many other things. All with the goal of unveiling the nature of dark matter, dark energy and perhaps identify deviations from general relativity. I will describe the mission, the key scientific goals and the first tests performed on the first data. The first images we got are extremely promising!