How routing is done in codeigniter?

How routing is done in codeigniter?

References

Reference NO 1

http://ellislab.com/codeigniter/user-guide/general/routing.html

Reference NO 2

http://stackoverflow.com/questions/15203816/how-routing-is-done-in-codeigniter

Reference NO 3

http://osvaldas.info/smart-database-driven-routing-in-codeigniter

Reference NO 4

http://net.tutsplus.com/tutorials/php/advanced-codeigniter-techniques-and-tricks/

Reference NO 5

http://codefury.net/2010/09/easy-reverse-routing-with-codeigniter/

Reference NO 6

http://kenai.com/projects/cms-codeigniter-rds/sources/cms-in-codeigniter/content/system/libraries/Router.php?rev=36

Reference NO 7

http://www.phpkode.com/source/p/codeigniter/CodeIgniter_1.7.2/system/libraries/Router.php

Reference NO 8

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