An ebook file, also known as an electronic book or digital book, is a computer file that contains text and possibly images and other multimedia content. It can be read on dedicated e-reading devices such as Kindle or Nook, or on computers, smartphones, and tablets using specialized software. Ebooks are usually available in several formats including PDF, MOBI, EPUB, and AZW, among others. They offer a convenient way to access books without the need for physical copies, making them popular with readers worldwide.