Graphs are often used to model relations and processes in physical, social, biological and informational systems. Emphasizing their application to real-world systems, they include vertices and edges that define the systems' networks. Preform an online search to find a graph model that represents a real-world system that clearly contains a network of vertices and edges. Using a paragraph or two, summarize the importance of the graph and how it explains the real life situation. Include in your writing which of the graph models ( i. e. social networks, communication networks, ) your system falls under. Also, answer the following questions:. a- are the edges of the graph undirected or directed or both?
b- if the graph is undirected, are multiple edges present that connect the same pair of vertices?
c- if the graph is directed, are multiple edges present?
d- are loops present?
Please don't forget to include a clear picture of your graph along with the typed paragraph(s), and site the link or include the link of the article.