As the title states, the minimum API level (OS version) that an Android app can run on can be set with android:minSdkVersion.

For details, see here.

・Android バージョン - Wikipedia

API levels (OS versions) can also be checked on Wikipedia.

・1. Android API レベル - ソフトウェア技術ドキュメントを勝手に翻訳

That’s all from the Gemba.