a blank or decorated leaf of paper at the beginning or end of a book, especially one fixed to the inside of the cover.
Do you know what’s one of the prettiest part of a book design? The endpapers. When books have patterned or illustrated endpapers, my heart swells in joy! Why don’t all books have endpapers? (I know it has to do with the cost and such, but let’s have more please!) Endpapers give the book an extra personal touch that I love seeing. I could line by walls with them and make my house look all Victorian if I wanted. (I always associate wallpapers with Victorian houses.) They never fail to give me heart eyes. If I see a book with endpapers, I will run straight for it, pushing every book without it out of my way to get to it.