Starspots are local magnetic fields on the surfaces of stars, just as Sunspots. Their fields are strong enough to suppress the overturning convective motion and thus block or redirect the flow of energy from the stellar interior outwards to the surface and consequently appear as locally cool and therefore dark regions against an otherwise bright photosphere. As such, starspots are observable tracers of the yet unknown internal dynamo activity and possibly allow a glimpse into the complex internal magnetic field structure. Starspots also enable the precise measurement of stellar rotation rate which is a key ingredient for the expected internal magnetic topology. But whether starspots are just blown-up sunspot analogs we do not know yet. Therefore, the existence of starspots, their surface location, their migration pattern, and in particular their link to the stellar dynamo and its internal energy transport, may have far reaching impacts also for our understanding of low-mass stellar evolution and formation.