why use www.google.com/jsapi, what this external link for?

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i dont get it, why add external link for?
$this->addHeaderItem('<script type="text/javascript" src="http://www.google.com/jsapi"></script>');


i commented the link and it's still working.
so what this google script for?

thank you.

Type: Discussion
Status: New
fastcrash
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concrete5 Environment Information

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