<init-param> and <context-param> are the name/value pairs that specify the initial values of the servlet/JSP variables.They contain the information that be used to customize and control the behavior of a servlet or a JSP.
The information stored in <init-param> is available in the context of a servlet or filter in the web application.
The information stored in <context-param> is available to the entire scope of the web application.The Context initialization parameters may be used as the basis of data that is made available to all servlets and JSP pages. Each web application consists of one ServletContext, which can be used as share resources.
For more information, visit the following links: http://www.roseindia.net/servlets/GettingInitParameterNames.shtmlhttp://www.roseindia.net/tutorial/servlet/getContextParameters.html