Can you explain what deep links are and how they work in mobile applications?

Deep links are URLs that direct the user not just to the app, but to a specific screen or content within the app.

In mobile applications, they work as follows:

1. The user clicks on the link (for example, in a browser, email, or another app).
2. If the app is installed, the system opens it and passes the link.
3. The app processes the link and navigates to the desired screen or section.
4. If the app is not installed, the user can be redirected to the app store for installation.

Example of usage in Android using Intent-filter:

<intent-filter>
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <category android:name="android.intent.category.BROWSABLE" />
    <data android:scheme="https" android:host="example.com" android:pathPrefix="/product" />
</intent-filter>

This allows opening the app via links like https://example.com/product/123 and displaying the product with id 123.