An e-book is an electronic book that is generally delivered to paying customers by way of a PDF file. E-books can actually be more costly than print books and you will often find people selling their e-book for $27, $37 or even $47.

E-books can be a fantastic addition to your library of offerings as it will provide your audience an opportunity to learn from you, without having to invest heavily or without having to commit to a one-on-one working relationship.

E-books also have a fairly low barrier to entry as they are easy to create and easy to fulfill. In most cases, you do not need to setup complicated systems to deliver your material - you can generally use the systems that are already in place on your website.