What a person actually looks like
A. genotype
B. phenotype
C. dominant
D. recessive

Phenotype :)

Phenotypes is the physical features expressed of an organism.

The titanic is the answer

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