Why do I need ContentPresenter in SilverLight?

You don't always need a ContentPresenter. It acts as a placeholder that will effectively host any content that you assign to its Content attribute. If you have an area on a given control/page that can hold dynamic content of an indeterminate type, a ContentPresenter is an effective way to hold the space.

From MSDN; so basically it's a placeholder for content in a template.

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