This is a lower-level API. Lower-level APIs are not recommended for most projects, and may not be available on all plans.
See our page on recommended deployment patterns for more information.
Annotations API Developer Documentation
Annotations API offers learners the ability to make notes, add multi color highlights to text, place sticky notes onto the page, and use a pen tool to annotate the content.
You would want to use this to create advanced assessments that show the learner's working and thought process while answering Questions.