Suppose that you plan to take a trip from San Diego to San Francisco and you have never made this trip before. You could use Google Maps and it would tell you to get on Interstate 5 going north until you get to San Francisco. Alternatively, suppose that you want to get to a specific address in San Francisco. In this case, Google would give you a map that tells you to get on Interstate 5 going north until you get to San Francisco. At this point, it would give you the freeway exit number needed and a detailed street map that would allow you to drive to the address you have chosen.

How does a map resemble a model and the realism necessary of that model?