Flexbook is a type of textbook that can be changed easily. It's like a regular book, but instead of being printed on paper it is made up of digital pages that you can rearrange and change. This means that you can create a book that is just right for you and your class. You can add new chapters or chapters from other sources, and you can rearrange the order of the chapters so it makes the most sense for what you are studying. Flexbook also makes it easier to update the content you have so you can keep your book up to date with the latest information in your subject.