Project Gutenberg, also known as Project Gutenberg (PG), is attended by volunteers who are committed to the electronization, archiving and publication of text works. This project started at 197 1, and it is the earliest digital library. Most of these books are original books in the public domain. Project Gutenberg ensures that these books can circulate freely and have an open format, which is conducive to long-term preservation and can be read on various computers.