The diagram shows the moon and Earth in space.
Which is the best label for the dotted-line arrow?
o force of Earth's gravity
moon's attraction to the Sun
O moon's motion without gravity
orbit of the moon around Earth
Earth
Moon

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