How the liferay portal page is loaded with respective portlets

When a user requests a page with a URL,

1.    The browser sends the request to the Application Server (AS).
2.    Liferay gets the page name from the URL.
3.    It goes to the layout database table and finds the related theme and page layout.
4.    Based on the page layout, Liferay finds the portlets added into each area of the page

       layout.
5.    Liferay runs the portlet and adds the output in the portlet.vm template.
6.    Liferay interprets the portlet.vm template and adds the output in the page layout.
7.    Then Liferay interprets the page layout and adds the output in the portal_normal.vm

        template.
8.    After that Liferay interprets the portal_normal.vm template and returns the output, 

       which is HTML markup, to the browser.
9.    The browser renders the HTML markup and presents the portal  page to the user.