  Euclid is a recently launched medium-class mission by the European Space
Agency (ESA) designed to measure cosmological parameters, test the cosmological
standard model, and explore the nature of dark matter and dark energy. To this
end, Euclid conducts a survey of up to 14000 square degrees of the
extra-galactic sky and obtains optical and near-infrared photometric
measurements for more than a billion galaxies as well as near-infrared slitless
spectroscopy for more than 35 million galaxies. These observations will be used
to estimate galaxy clustering and cosmic shear. It is expected that Euclid will
achieve percent-level constraints on the Dark Energy equation of state
parameter. The survey will also be exploited with a range of other cosmological
probes and prove revolutionary for non-cosmological science.
