How can readers access downloaded e-books without an Internet connection?

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A person holds a Sony e-reader displaying text in front of a large illuminated sign reading e-book multiple times at the Frankfurt Book Fair in Germany. — e-book An e-reader on display at the Frankfurt Book Fair, Germany, 2012.

Readers can access downloaded e-books without an Internet connection through several methods, depending on how the content was acquired and the software being used:

Downloadable Files: Many e-books are distributed as files that can be saved directly to a device, allowing them to be read offline at any time.1
Browser Caching: Some e-books are provided as web pages that can be cached by a web browser, enabling offline access after the initial loading process.1
E-reading Software: To read these files, users must have the necessary software installed on their personal computers, smartphones, or dedicated e-readers. It is important to note that if an e-book is protected by digital rights management (DRM), it may only be accessible through specific software controlled by the provider, such as the Amazon Kindle or Apple Books applications.1

While some systems are closed and proprietary, others—such as those utilizing Project Gutenberg—operate as open systems that allow for more flexible access to downloaded files.1