In the past, people used e-readers or e-book readers to read e-books. These devices usually had small screens and simple operations. However, with the development of technology, many devices have larger screens and more complex functions, making reading e-books more convenient and comfortable. One of the most popular e-book readers is the Kindle, which is a portable device that can be read on any flat surface and has a powerful content management system. In addition, many websites and applications also provide extensive search and filtering functions for e-books, as well as rich reading content. There are many other types of e-readers to choose from, such as the E-Reader and tablets. These devices come in different size and functions, and can be selected according to needs. In general, there are many convenient and small e-books that allow people to read their favorite books anytime, anywhere.