Please help me on UNBOUNDED PRECEDING and CURRENT ROW

Helllo Experts,
Kindly help me on below query..
SELECT
   SUM(n) AS month_amount,
SUM(SUM(n)) OVER
    (ORDER BY n ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
    AS cumulative_amount
FROM t1
GROUP BY n
ORDER BY n;Here i need explanation over(what it does) over() and (ORDER BY n ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)And if you have any Docs over ANALYTICAL functions please help with them.
Ur help ll be appreciated..
Thanks
Basav

http://download.oracle.com/docs/cd/E11882_01/server.112/e26088/functions004.htm#SQLRF06174
Regards
Etbin

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Please help me on UNBOUNDED PRECEDING and CURRENT ROW

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