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what is the use of apex:param tag in Visual Force 

<apex:outputLink value="http://google.com/search">

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    <apex:param name="q" value="{!contact.name}"/>

</apex:outputLink>

If i click Preview in Visual Force page it is simply linked to contacts page,how the tag is working?please explain with example

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So the name & value attribute of <apex:param will form a key value pair parameter appended to the URL. See the below example, which represents with param and without param. The name attribute q and value attribute account.name forms the ?q={!account.name} appended to the URL.

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