A blurb is typically a 1-2 line endorsement provided by a celebrity or well-known authority often featured on the front or back cover of a book, but many authors also like to include them in the front matter of their book as well.
You can also use this specially formatted page to share an editorial review. When publishing through KDP, the first few pages of your book can be seen using the “Look Inside” feature on Amazon, and blurbs are a great way to capture interest and show social proof for your book.