explain data relationship in the README example

Can you explain how the data relate to the labels? I'm referring to this:

data = [[40.71,-74.01],[34.05,-118.24],[39.29,-76.61],
        [45.52,-122.68],[38.9,-77.04],[36.11,-115.17]]

labels = ['New York', 'Los Angeles', 'Baltimore', 
          'Portland', 'Washington DC', 'Las Vegas']