Temp Tables in Oracle?

Hi.
Where can i find information abount using temp tables in Oracle?
I usually work with SQL Server and use temp tables. I don't have any idea about temp tables in Oracle. Could you give me any information?
Thanks.
I'm sorry for may english, I'm spanish.

There are two completely different things being discussed here temporary segments used by Oracle's internal processes and Oracle global temporary tables.
Or did I misunderstand?
We have used Oracle's global temporary tables as quick staging array while data is being integrated into finance apps. Testing showed the process performed faster with this design.
Both temporary segments and Oracle's global temporary tables are stored in the TEMP tablespace.

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