What is the concept of API of Application?

I read all docs of Auth0, but I don’t get the concept of API of Application.
I made an API, then it created machine-to-machine Application implicitly.
What can I do with API?

Hi @json

The auto-created M2M application is for testing.

An API is Auth0’s representation of an API called by your application. The API has an audience that is used when generating access tokens. When your API gets a call, it should make sure it has a valid access token.


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Thank you.
Could you show me any real world use case of API?