Oracle Streams in 10g

Hi All,
I am new to Oracle Streams in 10g, Could any one explain me what is Oracle streams and why we have to use it and related documents.
Please don't hesitate me to reply.
Thanks,
Redro.

You can get overview from the below link:
http://www.oracle.com/technology/products/dataint/htdocs/streams_fo.html
Step by Step guide to implement streams:
http://it.toolbox.com/blogs/oracle-guide/oracle-streams-step-by-step-17095

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    Oracle Streaming in 10g database
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