End sheets refer to the first and last pages of a book, bound to the covers and hiding them from view. They are typically thicker than the other pages and can be adorned with images or designs for decorative purposes. End papers is the British term for end sheets. They are also known as endleaves, flyleaf, flyleaves, endpapers, or casing papers. Other variations include front end sheet, front flyleaf, back flyleaf, or back end sheet. These terms are used interchangeably and depend on the preference of the publisher or designer. Regardless of their name, end sheets serve an important function in both protecting the book and creating an attractive opening and closing impression.