I don't completely understand what is swap space!

The only information that I have swapped spaces is
http://openssi.org/cgi-bin/view?page=docs2/1.2/Introduction-to-SSI 
VII: Swap 
   Swap space is not particularly SSI, with each node providing its own
swap space.  Swap space designation is done in the common /etc/fstab.
To determine which nodes are using which swap, you can execute an
onall swapon -s.

I've read on the forum (something like) swap space is on a partion.

So what exactly is swap space and where would it be in the node?
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