Internet's root servers are essentially massive directories: they match an internet address with a physical location and route a user's request accordingly. They also keep track of registered website names, as well as newly approved extensions
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/root-question
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/internet