What is the role of UpdatePanel in ASP.NET AJAX?

Triggers for a given UpdatePanel, by default, automatically include any child controls that invoke a postback, including (for example) TextBox controls that have their Autopostback property set to true.

UpdatePanel is the control that facilitate the partial page rendering functionality in an ASP.NET application. As discussed earlier that using ASP.NET AJAX, we can communicate with a web server asynchronously and update a part of a page without a complete page postback. In order to apply partial page update/rendering, we can add one or more UpdatePanel controls to our ASP.NET Page as follows:

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