Choice widget annotations provide interactivity in the form of pop-up menus and lists. You can set the type of list in the inspector. New choice widget annotations default to pop-up menu style.
Each choice widget annotation can define a list of possible choices and a default value that is shown when the document is opened. This value need not be, and often is not, an available choice in the list. It may for instance be a text prompting the user to choose an entry from the list.