Why is it important to set a minimum SDK version in an Android project?

Setting the minimum SDK version in an Android project is important for several reasons:

• Compatibility: The minimum version determines on which devices the app can run. If the version is too high, the app will not work on older devices.
• API Availability: The minimum SDK version ensures that all APIs used in the app are available on the device.
• Optimization: It allows using new platform features while not excluding too many users.

For example, if the minimum SDK version is set to 21 (Android 5.0), the app will not launch on devices with Android 4.4 and below.