Astudent writes a term paper about similarities and differences between
greek democracy during the classical era and u. s. democracy during the
modern era. her paper focuses on which major historical theme?

Creation, expansion, and interaction of political systems

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it