Session are very helpful  to associate some data with each visitor.  You may pass and retrieve values in diffrent page using sessions. All sessions are an object associated with each web client. Servlet container (our Java enable server like eg. Tomcat) controls session data.

In this sample code we will create a session named `username` and later put a value inside our new Session object. On next step we will get our session value.

Here we are creating a new session and session's name is username.

<%  
   session.setAttribute( "username", "myusername" );
%>

<%= session.getAttribute( "username" ) %>