A good example of this is when a company offers an eBook for free once visitors sign up for their mailing list. A PDF can be used in this way, providing exclusive information that isn’t available elsewhere. In turn, the PDF provider gets a link and other useful information about a prospective customer or contact
Here is the List:
This may not be the best option for a PDF of an essential product manual, for instance, but it works well for a PDF that includes useful or interesting information that will help them before they make a purchase or to get better results from that purchase.