Thanks Jean Jenkins again for sharing!

How to Write a Book Blurb | Self-Publishing Advice Center

Please, newbie writers, learn your terminology re what goes on your book cover. A BLURB is written by someone else, usually a line or two by another writer, with words of praise for your story. BACK COVER COPY (or cover copy) is the longish graf on the back cover that tells readers about your story. Now with that in mind, I give you this reasonably good post with mostly good tips but wrong terminology — and ignore #4; the back cover is not the place for this kind of info. At all.