Working with Xamarin Forms Animation class and Animation Extensions

Hi Guys ,

I have seen the Animation and Animation Extensions in the Xamarin forms.But I dont know how to apply in the Xaamrin forms.Can Any one explain me how and where we use this concepts in the Xamarin forms.If possible small example page[Xamarin forms or XAML page ] for my understanding.Below are the links that I studied.

https://developer.xamarin.com/api/type/Xamarin.Forms.AnimationExtensions/

https://developer.xamarin.com/api/type/Xamarin.Forms.Animation/