What is the family name in Germany?

Can you please clarify for me, in the context of Germany, what exactly do you mean by "family name"? Are you referring to the surname that typically follows an individual's given name, and is often inherited from one's ancestors? Or is there a particular aspect of German family names that you're interested in learning more about? Additionally, are there any specific cultural or historical factors related to German family names that you would like me to address?