What are annotations on a slide primarily intended to do?

Annotations on a slide are primarily intended to help the audience better understand the content. They provide additional context, clarity, or emphasis on key points, making it easier for viewers to grasp the main ideas being presented. Annotations can include notes, explanations, or even highlights that draw attention to specific information, enhancing comprehension and retention of the material discussed.

While artistic embellishments may visually enhance a presentation, they do not serve the functional purpose of aiding understanding. Similarly, while marking the beginning of a presentation or providing legal advertisements may have their own significance in different contexts, these purposes do not align with the primary role of annotations, which focuses on facilitating the audience's comprehension of the main content presented.