Include One Visualforce Page within Another

How to Include One Visualforce Page within Another

Sample Code:

<apex:page>
    <p>Test Before</p>
    <apex:include pageName="MainPage"/>
    <p>Test After</p>
</apex:page>

here MainPage is a another Visualforce page.

<apex:page >
Main Page : Welcome to anusalesforce.blogspot.in
</apex:page>