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vijay bhaskarvijay bhaskar 

define action pollar

Abhinav MIshraAbhinav MIshra
A timer that sends an AJAX request to the server according to a time interval that you specify. Each request can result in a full or partial page update.

An <apex:actionPoller> must be within the region it acts upon. For example, to use an <apex:actionPoller> with an <apex:actionRegion>, the <apex:actionPoller> must be within the <apex:actionRegion>.

Considerations When Using <apex:actionPoller>

Action methods used by <apex:actionPoller> should be lightweight. It's a best practice to avoid performing DML, external service calls, and other resource-intensive operations in action methods called by an<apex:actionPoller>. Consider carefully the effect of your action method being called repeatedly by an <apex:actionPoller> at the interval you specify, especially if it's used on a page that will be widely distributed, or left open for long periods.
<apex:actionPoller> refreshes the connection regularly, keeping login sessions alive. A page with <apex:actionPoller> on it won't time out due to inactivity.
If an <apex:actionPoller> is ever re-rendered as the result of another action, it resets itself.
Avoid using this component with enhanced lists.
  
<!--  Page -->
                        
			
<apex:page controller="exampleCon">
    <apex:form>
        <apex:outputText value="Watch this counter: {!count}" id="counter"/>
        <apex:actionPoller action="{!incrementCounter}" reRender="counter" interval="15"/>
    </apex:form>
</apex:page>
			
			
/***  Controller: ***/
			
public class exampleCon {
    Integer count = 0;
			
    public PageReference incrementCounter() {
        count++;
        return null;
    }
			
    public Integer getCount() {
        return count;
    }
}


For Reference Please check link :http://www.salesforce.com/docs/developer/pages/Content/pages_compref_actionPoller.htm

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Thanks!