The James Webb Space Telescope: our new window on the Universe.

The successful launch, deployment and commissioning of the James Webb Space Telescope has opened a new era in astronomy and astrophysics. Indeed, in some infrared spectral bands, Webb's sensitivity is up to three orders of magnitude higher than previous facilities. Such a huge leap in sensitivity has happened very rarely in the history of astronomy and, even more broadly, in the history of science. To put it into a context, it is equivalent, in the visible, to suddenly passing from Galileo's telescope to modern 10 m-class telescopes. The first year of observations has certainly not disappointed, revealing several unexpected results. I will give a brief overview of the early, exciting findings obtained with Webb, spanning from the characterisation of exoplanet atmospheres to the detection of new classes of galaxies in the early Universe.