PDF forms are among the famous file types where you may enter information, select items from drop-down boxes, and also check fields as needed. PDF currently supports two different methods for integrating data and PDF forms i.e. AcroForms (also known as Acrobat forms) and XML Forms Architecture (XFA) forms. In order to fill the forms, you may either complete the form online or save a copy of the form on your computer and use Adobe Acrobat Reader to fill in the form.