What do the so-called "stumbling stones" in Germany commemorate?

Question

Accepted Answer

the victims of National Socialism.. 'Stolpersteine' (Stumbling Stones) are brass-plated memorials installed in the pavement in front of the last known residences of victims of National Socialism. They serve to keep the memory of individuals alive where they once lived.

Woran erinnern die sogenannten 'Stolpersteine' in Deutschland?

Woran erinnern die sogenannten 'Stolpersteine' in Deutschland?