What is hd Journaling?

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what exactly is journaling?

should I have it on or off?
 
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One of the things I have always wondered about journaling is this:

Jounaling essentially seems to write each transaction twice: once to the journal and then to the intended destination...or perhaps once to some sort of "holding tank" for the data, plus the journal for the disk structure change recording, and then to the final destination.

Since each transaction is more or less written twice, doesn't journaling slow down write throughput to a disk?

Does anyone here know the answer? I could research this for a few hours on the web, but I am taking the lazy way out and asking first.
 

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