Material Design was introduced in Android Lollipop version and is considered as an extensive guide for motion, visual, and interaction design across various devices and platforms. One can also use the design support library to integrate components, patterns as well as the material design. This supporting library is compatible with Android 2.3 (Api level 9) and above.
You can apply the material theme in your app by specifying a style that inherits from android: Theme. Material:
<!-- res/values/styles.xml -->
<!-- your theme inherits from the material theme -->
<style name="MyAppTheme" parent="android:Theme.Material">
<!-- theme customizations -->