A site is a collection of openly available, woven Web web pages that share a single domain. Web sites can be produced as well as kept by a specific, group, organisation or company to offer a range of purposes. Together, all publicly available sites constitute the Web. Websites come in a nearly endless variety, including educational sites, news sites, forums, social media websites, ecommerce sites, and so on.
What is Pligg?

Pligg is an open source content management system that lets you easily create your own user-powered website.