Abstract
In 2020 CERN started the Feasibility Study for the construction of Future Circular Colliders (FCC) in the Geneva region with a circumference of about 91 km. An electron-positron collider (FCC-ee), that would cover the energy range from the Z pole (and maybe below)  up to the top pair production threshold (and maybe above) is the possible first step for the collection of an unprecedented amount of Z, W, Higgs and top particles. The ultimate goal is a proton-proton collider (FCC-hh) at about 100 TeV, which could also be used for Heavy Ions collisions. The combination of these two machines, FCC-ee and FCC-hh, offers an incredible discovery potential, unique on the market, with a careful mixture of precision measurements sensitive to very weak coupling or very heavy objects, and very high energies where the new heavy particles could be directly produced.



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