Integrating Firebase SDK
Understand how to add the Firebase SDK to your application and initialize it for use with various services.
Your App's Firebase Toolkit
The Firebase SDK (Software Development Kit) is the toolkit Firebase gives you — the code and tools that let your app talk to Firebase services.
Why Integrate the SDK?
Why the toolkit? Without the Firebase SDK, your app simply cannot reach Firebase. It is the bridge to auth, databases, storage, and the rest.