What is the simplest way to add authentication to an app?

I am developing my first app and I would like to add a means of authentication to restrict access to my app. What is the best and/or simplest way to do this?

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I would like to add a means of authentication to restrict access to my app.

What platform are you targeting?

And what do you mean by “authentication”? Can you walk us through the user experience you’re looking for?

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