Difference between ServletRequest.getRequestDispatcher and ServletContext.getRequestDispatcher

• request.getRequestDispatcher(“url”) means the dispatch is relative to the current HTTP request.
  Example code: RequestDispatcher reqDispObj = request.getRequestDispatcher("/home.jsp"); 
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• getServletContext().getRequestDispatcher(“url”) means the dispatch is relative to the root of the ServletContext.
  Example code:RequestDispatcher reqDispObj = getServletContext().getRequestDispatcher("/ContextRoot/home.jsp");