What is the main role and purpose of style rules in interface and application development?

Styling rules in interface and application development serve to ensure consistency and ease of maintaining the design. They allow centralized setting of colors, sizes, margins, fonts, and other parameters, which simplifies changing the appearance of the application without the need to edit each element separately. In Android, this is implemented through resource files such as styles.xml, where themes and styles can be defined and then applied to interface elements.

Example of using a style in Android:

<style name="CustomButton">
    <item name="android:background">#FF5722</item>
    <item name="android:textColor">#FFFFFF</item>
    <item name="android:padding">16dp</item>
</style>

Then, this style can be applied to a button in a layout:

<Button
    style="@style/CustomButton"
    android:text="Press me" />