Is it safe to expose Firebase apiKey to the public?

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The Firebase Web-App guide states I should put the given apiKey in my Html to initialize Firebase:

// TODO: Replace with your project's customized code snippet
<script src="https://www.gstatic.com/firebasejs/3.0.2/firebase.js"></script>
<script>
  // Initialize Firebase
  var config = {
    apiKey: '<your-api-key>',
    authDomain: '<your-auth-domain>',
    databaseURL: '<your-database-url>',
    storageBucket: '<your-storage-bucket>'
  };
  firebase.initializeApp(config);
</script>

By doing so, the apiKey is exposed to every visitor.

What is the purpose of that key and is it really meant to be public?

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