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C#

The difference between composition and inheritance

I'm not sure I fully understand the difference between inheritance and composition. 🙁

Jeremy mentioned in this video that...

"Most developers prefer to use composition and implement the interface, instead of inheriting from a base class."

But when we (apparently) used composition to create the ResurrectingInvader.cs class — isn't this just a case of the class inheriting the interface?

How is that different from the Invader.cs class using the IInvader interface? Is that also an example of composition?