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Defining Web pages, Web sites and Web captures

The Internet Archive has been archiving the web for 20 years and has preserved billions of webpages from millions of websites. These webpages are often made up of, and link to, many images, videos, style sheets, scripts and other web objects. Over the years, the Archive has saved over 510 billion such time-stamped web objectswhich we term web captures.

We define a webpage as a valid web capture that is an HTML document, a plain text document, or a PDF.

domain on the web is an owned section of the internet namespace, such as google.com or archive.org or bbc.co.uk. A host on the web is identified by a fully qualified domain name or FQDN that specifies its exact location in the tree hierarchy of the Domain Name System. The FQDN consists of the following parts: hostname and domain name.  As an example, in case of the host blog.archive.org, its hostname is blog and the host is located within the domain archive.org.

We define a website to be a host that has served webpages and has at least one incoming link from a webpage belonging to a different domain.

As of today, the Internet Archive officially holds 273 billion webpages from over 361 million websites, taking up 15 petabytes of storage.