The role of the cell membrane is most likely the job of which person

It is specifically a job of a guard since they let people in and out of a building and they basically protect their wall or their tower. And if you want to connect this to our human body, it basically connects to the brain because the brain is basically a wall for your skull.

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