Description: Annotations are notes, stamps (approval, denials) - any mark left on a document.
You can find Annotations at the top toolbar of the document:
There is also a button that can turn on and off the Annotations. If someone's notes or approval/denial is in your way of reading said document, push the little box all the way to the right (Blue and white boxes). If the button is indented, this indicates that the Annotations are visible. Click on that button and if it's popped out, looking like all the other boxes, this hides the Annotations.