Silverlight WCF C#

Hi Experts,

I am working on a silverlight C# application. It is a data driven application.

I am doing the databinding, by simply including the controls (Either text box, .....or datagrid) and binding with the source using datacontext or by using item source and in the controls  i am giving {binding Propertyname/ Path=Propertyname}.

My confusion is about the FrameworkElement and Dependency Property.

What is framwork element? Is is the normal UI control they are talking about or what is this?
Why do we need this?

And What is dependency property?

How the framworkelement is different from normal ui controls?
How the controls usual property like text, font...are differed from dependency property?

Please explain.

Thankyou