There are a number of possible purposes for a social network. You now have a good understanding of how to analyze the basic characteristics of your social network or that of another individual. Network is a social relationship which helps transfer information such as travelling from one place to another. It also helps people get to different destinations more quickly if they need to travel in a long distance or two destinations. It is suitable for old cities with high-density population like Paris. There are thousands of trips and too many travelers every day in Paris. The transportation network in Paris provides thousands of public services and links them together. A good network can help people with long-distance or multi-destination trips. In cities with high-density population such as Paris, people would better carefully plan their journeys by looking at the routes of the network in advance, to reduce the density of commuters at the same time.