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The abundant production of beauty and charm hadrons in the $5 \times 10^{12}$$Z^0$ decays expected at FCC-ee offers outstanding opportunities in flavourphysics that in general exceed those available at Belle II, and arecomplementary to the heavy-flavour programme of the LHC. A wide range ofmeasurements will be possible in heavy-flavour spectroscopy, rare decays ofheavy-flavoured particles and $C\!P$-violation studies, which will benefit fromthe low-background experimental environment, the high Lorentz boost, and theavailability of the full spectrum of hadron species. This essay first surveysthe important questions in heavy-flavour physics, and assesses the likelytheoretical and experimental landscape at the turn-on of FCC-ee. From thiscertain measurements are identified where the impact of FCC-ee will beparticularly important. A full exploitation of the heavy-flavour potential ofFCC-ee places specific constraints and challenges on detector design, which insome cases are in tension with those imposed by the other physics goals of thefacility. These requirements and conflicts are discussed.

Heavy-quark opportunities and challenges at FCC-ee