Graphs and NetworksApplications
While websites and hyperlinks form a virtual graph, there is also the physical network of computers, servers, routers, phone lines and cables.
Every time you make a phone call or load a website, network operators have to find a way to connect sender and receiver, without exceeding the capacity of any individual cable or connection. Graph theory and probability make it possible to guarantee a reliable service, for example by finding diversions when a particular connection is busy.