In yearbooks, end sheets are typically made of a heavier weight paper than the rest of the book. This helps to protect the book from wear and tear. End sheets also help to keep the book from bending or warping, which can damage the pages.
End sheets can also be used to add visual interest to the book. They can be printed with a design or pattern, or they can be left blank. Some yearbooks also include a pocket or envelope inside the front end sheet, which can be used to store photos or other mementos.
Overall, end sheets play an important role in yearbooks. They protect the book from damage, they provide structural support, and they can also be used to add visual interest to the book.