Yii uses path aliases extensively. A path alias is associated with a directory or file path.       It is specified in dot syntax, similar to that of widely adopted namespace format: RootAlias.path.to.target                                                                                                               Link: http://www.yiiframework.com/doc/guide/1.0/en/basics.namespace

There are two application types bundled with Yii which are as follows:                                             
1. Web application (CWebApplication)       
2.  Console application (CconsoleApplication)            
Both are extended from CApplication, so both console and web applications are sharing its components

1.	coreMessages
2.	db
3.	messages
4.	errorHandler
5.	cache
6.	format

1.	Lists: CList, CtypedList
2.	 Maps: Cmap, CattributeCollection
3.	 Queue: Cqueue
4.	Stack: Cstack

To configure URL rules we have to  add the below to our rules in protected/config/main.php:
'home' => 'site/index',
'page/<alias>' => 'site/page',
Save the above changes and browse the following URLs:
 /home
/page/test	
Page:39