List some advantages of being multicellular

There are a few advantages:
The organism is larger.
Cell differentiation- having different type of cells with different functions

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