Digital libraries are online collections of digital resources, such as books, articles, images, and videos. They provide easy access to a vast amount of information from anywhere with an internet connection. Users can search for specific materials, read them online, or download them for later use. These libraries often include resources from various fields, including science, history, and literature. Many digital libraries are maintained by institutions like universities or public libraries, ensuring that valuable information is preserved and made available to the public. Examples include Project Gutenberg and Google Books.