what is the difference between Application Server and Web Server in Java? [duplicate]

what is the difference between Application Server and Web Server in Java?
[duplicate]

References

Reference NO 1

http://stackoverflow.com/questions/15189569/what-is-the-difference-between-application-server-and-web-server-in-java

Reference NO 2

http://stackoverflow.com/questions/5039354/difference-between-an-application-server-and-a-servlet-container

Reference NO 3

http://docs.oracle.com/cd/E15051_01/wls/docs103/programming/classloading.html

Reference NO 4

http://javarevisited.blogspot.com/2012/05/5-difference-between-application-server.html

Reference NO 5

http://pic.dhe.ibm.com/infocenter/wasinfo/v7r0/topic/com.ibm.websphere.nd.doc/info/ae/ae/tins_webplugins_remotesa.html

Reference NO 6

http://geekexplains.blogspot.com/2008/06/web-server-web-container-application.html

Reference NO 7

http://www.javaworld.com/javaqa/2002-08/01-qa-0823-appvswebserver.html

Reference NO 8

http://zeroturnaround.com/rebellabs/the-great-java-application-server-debate-jboss-as7-aka-wildfly/