Specify what system should be use to remember the state of views when user navigate.<br><span style="color: rgb(0, 0, 204); text-decoration: underline;">cookie:</span> enable the user to come back to they previous navigation even after session expire.<br><span style="color: rgb(0, 0, 204); text-decoration: underline;">session</span>: potentially more secure, remember the views state only in the same session.<br>