Do you mean the blurb? Or the glossery is the box which explaines what words in the book mean. I don't get what things you are talking about. Try and be a bit more exact and I may be able to help you.
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The back cover. Some categories that can be at the back of a book are as follows: Glossary (of terms), Index (of Chapters), Bibliography (list of associated reference material, books etc)
The back of a book is called the "back cover". It typically includes a book summary, author bio, blurbs, and sometimes an author photo.