Form objects, commonly referred to as form fields, are the nuts and bolts of a form. They're the boxes and buttons that people click on or type in to make their mark (technically called their input) on a form.
There are five different common flavors of form objects, each of which has its own button on the Forms category of the Insert bar (Figure 15.9), as well as its own entry in the Insert > Form menu. Some of the less common ones appear as well.