The metadata for a service class provides the information Angular needs to make it available to components through dependency injection (DI).
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Some people are better at maths than others: no one thinks you can be 'taught' to be a mathematical genius. And no one thinks of teaching, in that context, as a kind of forcing of the will. But there seems to be an idea of writing as an intuitive pastime which is being dishonestly subjected to counterintuitive methods.