To enable the Look Inside the Book feature on Kindle, create a Kindle book. Amazon automatically adds Kindle titles to the Look Inside the Book program, as of 2015. You can also sign up to use this feature on Amazon.com if you are an author or publisher with printed books.
Amazon offers the Look Inside the Book program to you if you are an author or publisher who wants to sell or promote a book through Amazon.com. This program allows potential buyers to sample a book, buy it instantly with Amazon's 1-Click option or drop it into their online shopping carts and improve their search results. If you create your book as a Kindle formatted e-book, there are no further steps to take to enable the Look Inside the Book feature since Amazon uses the Kindle sample as the Look Inside sample.