===>Spring
	-dependency injection
	-loosely coupled
===>layer to develope bussiness application
	-UI Layer
	-Service Layer
	-Data Access Layer
	-DB

===>Spring IOC container
	-predefined program
	-used to creaing object holding object memory
	-complete life cycle of object manage by ioc container
===>Application context
	-we retriev object value from ioc container
	-ClasspathXMLApplicationContext 	= scan xml file from java class path
	-AnnotationConfigApplicationContext 	= use those beans where we use annotation
	-FileSystemXMLApplicationContext 	= if want to scan configuration file from file file system the we used

===>beans file = to set the object of class we give information to a file and that file is our beans