Can Someone Explain CDATA to me Please?

I have read a bit about this honest, but everything I have come accross is too technical for me!
What started me thinking about it is seeing this:
<style type="text/css">
/*<![CDATA[*/

/*]]>*/
Is that important? I don't normall include styles in a HTML page with the CDATA part in and it all works OK so, should I be doing this and if I do, will it help in my quest for WWW domination?
Regards
Martin

To give an example, Google Analytics Tracking Code does not validate on XHTML pages without CDATA.
http://alt-web.blogspot.com/2008/02/google-analytics-tracking-code-does-not.html
HTML & XHTML behave differently. If you insert JavaSript into an HTML page, the validator treats everything after the script tag as CDATA (character data) and ignores it. Fine.
In XHTML pages, JavaScript is considred PCDATA (parsed character data) and thus doesn't validate. Not so fine.
Inserting the CDATA tags into your JavaScript code effectively tells the validator to "ignore me" so the page won't 'break' or fail validation.
Nancy O.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
www.alt-web.com/
www.twitter.com/altweb
www.alt-web.blogspot.com

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