Online libraries are digital platforms that provide access to a vast collection of books, articles, and other resources over the internet. Users can browse, search, and read materials from the comfort of their homes, making it easier to find information on various topics. Many online libraries also offer features like e-books, audiobooks, and academic journals. These libraries often require a membership or a library card for full access, but many resources are available for free. Examples of popular online libraries include Project Gutenberg, which offers free e-books, and Google Books, which provides previews and access to a wide range of publications.