Annotations typically refer to objects added to a PDF to enable users to mark-up PDFs in a meaningful way. Annotations are included in a PDF but are not part of the original PDF content, allowing the users to select, move and edit them as needed quickly and conveniently.
This section focuses on text, links, and other annotations. However, highlights, lines, and shapes are PDF annotations as well. View each segment to learn more.
Also see Highlight, Underline, Strikethrough, and Squiggle, and Drawing and Objects.