Selenium is primarily used for automating web applications for testing purposes. It provides a way to interact with web browsers programmatically, allowing you to simulate user interactions like clicking buttons, filling forms, and navigating between pages. Selenium is available for various programming languages, such as Java, Python, C#, and more.

However, Selenium itself is not typically used directly for Android app automation, as Android apps are different from web applications and have a different underlying architecture. For automating Android apps, you would typically use tools and frameworks designed specifically for mobile app automation.

Some popular frameworks and tools for automating Android apps include:

1. Appium: Appium is an open-source mobile app automation tool that allows you to automate both Android and iOS apps using the same API. It uses the WebDriver protocol, which is also used by Selenium for web automation.

2. UI Automator: UI Automator is a framework provided by Google for testing Android apps. It allows you to write tests to interact with the UI elements of an Android app, making it a powerful choice for native app automation.

3. Espresso: Espresso is another framework provided by Google for testing Android apps. It’s focused on providing a concise and reliable way to write UI tests for Android apps.

4. Calabash: Calabash is an open-source framework that allows you to write tests for Android and iOS apps using a single, consistent API.

If you’re interested in automating interactions with web-based components within an Android app, you might still be able to use Selenium in combination with other tools, depending on the specific requirements of your project.