Jession id importance

I'm not getting why jsession id is important and when I need to use it?  I know that there are basically  3 ways to do session tracking...

1.  Cookie
2.  hidden form field method
3. url rewriting

But, my pages work just fine without considering this...when do I need to consider this?  I eventually will have my application go over https/ssl.  Is this the same during that case as well.
lcorAsked:
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Siva Prasanna KumarConnect With a Mentor Principal Solutions ArchitectCommented:
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objectsConnect With a Mentor Commented:
If you wanted to store some data (in the session) between request.
For example when someone logs in to a site you may want to store the fact that they are logged in and there details in the session so subsequent requests wopuld know they had already logged in.

The session id is used to identify the HttpSession for the user session.

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