Action Function in Salesforce ?

Action Function is an apex component in visual force page. Apex: Form tag enclosed in the action function tag, which can be able to call the controller method. Action function invoked from the JavaScript as XHR (XML Http Request).   For Details

 <apex:form >
 <apex:actionFunction action="{!register}" name="registerStudent"
 <apex:param name="studentData" value="" />

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