Cells are the unit
in a living thing capable of
performing all life processes.
A.
B. smallest
brightest
C. slowest
D. largest

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