An exercise book is a notebook that is used to record written work, typically in a school setting. It is usually bound and has a stiff cover to protect the pages inside. A line exercise book typically has ruled lines on the pages, which can be helpful for organizing written work and keeping handwriting neat and legible. Exercise books are often used in primary and secondary schools to record homework assignments, class notes, and other written work. They are also used by students to practice their handwriting, spelling, and grammar skills.