What is the movement of any type of molecule from a region of higher concentration to a region of lower concentration

It is called passive transport. e.g. by diffusion

Confused on question what should we be answering

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