Refers to a group of web pages or sites that, together are referred to as one website, i.e., www.brandeo.com.

See below for examples of the differences between a URL (Uniform Resource Locator), domain name and registered domain name:

URL: http://www.brandeo.com/index.html

Domain name: www.brandeo.com

Registered domain name: brandeo.com

Sources: Nielsen NetRatings, Wikipedia