What are the 3 differences between dna and rna

The sugar present in a molecule of RNA is ribose
The sugar present in a molecule of DNA is deoxyribose.

DNA uses A-T (Adenine-Thymine), G-C (Guanine-Cytosine)
RNA uses A-U (Adenine-Uracil), G-C (Guanine-Cytosine)

DNA functions as a medium of long-term storage and transmission of genetic information.
RNA transfers the genetic code needed for the creation of proteins from the nucleus to the ribosome. This process prevents the DNA from having to leave the nucleus, so it stays safe. Without RNA, proteins could never be made.

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