PDF stands for “Portable Document Format”. It is a file format developed by Adobe, which is a standard of open file exchange recognized by ISO. When documents, forms, images and websites are converted to PDF, what you print is what you see. Differs from classic document prints, PDF can include clickable links, buttons, form fields, video, audio, and logics that help automate routine business procedures. When PDF is shared, readers can open with free Adobe Reader either on personal computers or portable devices.