So people know if it's their type of book and if it interests them
The Passage on the back cover of a book is called a Blurb.
I read a Blurb about the author at the back of a book.
a blurb is a piece of infomation at the back of the book (clue to the story
The term "blurb" originated from a humorously contrived promotional quote on the back cover of a book by Gelet Burgess in 1907. The fake testimonial was attributed to a "Miss Belinda Blurb," which eventually stuck as a lighthearted term for brief promotional text on book covers.
A brief publicity notice, as on a book jacket.Read more: blurb
The blurb
The words on the back of a book are called the book blurb or back cover copy. They provide a brief summary of the book to entice readers to pick it up and learn more.
blurb
The blurb
Blurb
The blurb.
The Blurb