Free books refer to books that can be obtained and read for free. This kind of book does not need to be bought or borrowed. Free books can be obtained in public libraries, e-book websites, non-profit organizations and community activities. Usually free books are not low-quality documents, but books equivalent to other books, including novels, history, science, philosophy and so on. For those readers with financial difficulties, free books provide a convenient, efficient and legal way to acquire knowledge.

In recent years, many organizations and individuals have begun to provide free book services to the public. Public libraries have always been the main source of free books, but some private organizations and individuals have also begun to actively participate in this field. For example, some academic publishing societies provide their academic journals, e-books and other resources to researchers and readers free of charge, and set up websites for free access and download. In some communities in Africa and South Asia, free book activities and reading clubs are becoming more and more popular. These entrepreneurs and philanthropists hope to help people who need knowledge and cultural enlightenment by providing free book services.

Free books not only bring convenience to people, but also promote the popularization and enjoyment of knowledge. By getting books for free, readers can avoid having to give up reading because of lack of funds. These free resources can provide people with more choices, break down information barriers and spread knowledge and culture more widely. Of course, this free service also needs some fund-raising and sponsorship to support the maintenance, management and updating of books, but in general, it provides an opportunity for people to help and enjoy each other.