Binding component value to a property or  to an implicit object?

Sorry for that newbie question, but it confuses me...
What is the differnce between binding component value to a property and binding this value to an implicit object? In both cases i can refere to the value inside jsp file by:
#{MyBean.someValue}.
The difference is that in first case I need to declare:
<managed-bean>
<managed-bean-name>MyBean</managed-bean-name>
<managed-property>
<property-name>someValue</property-name>
<value>value</value>
</managed-property>
</managed-bean>In second case I don't need to declare anything.
When should I use first type of binding and when the second one?
What are the restrictions in using implicit binding?

The definition of EasingColorKeyFrame class support Dependency Object.
https://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.media.animation.easingcolorkeyframe.aspx.
http://stackoverflow.com/questions/8892234/binding-easingcolorkeyframe-value.

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