servlet Request Dispatcher path

Hi,

I was reading as below.

Request Dispatcher


After supplying a String, a path to the JSP file If the path begins with a slash, it is relative to the current context root
Otherwise, it is relative to the servlet location.
Then we do
view.forward(request, response);

After added the result information to the HttpRequest object forward the whole thing to the JSP

I have not understood relative path to servlet location vs relative path to current context root. What is the difference between them and when we use which one and what are advantages and disavantages of each one. What is the absolute path and when we use it.

Please advise.

Any links resources ideas highly appreciated. Thanks in advance