context,servlet, path info

The servlet engine splits the URI into three useful sections: the context path (application prefix), the servlet path, and the path info.

For example, given an application prefix of '/myapp', the api /myapp/dir/test.jsp/data will be split as follows:

/myapp/dir/test.jsp/data	getRequestURI()
/myapp	getContextPath()
/dir/test.jsp	getServletPath()
/data	getPathInfo()

REF : Servlet API