This refers to webpages that have no links to any webpage. This means that bots that enter this page would not be able to move to different pages. Page optimization is urgent for these kinds of pages, and adding relevant links would help bots and users navigate through the content.
Sean Si is a Filipino motivational speaker and a Leadership Speaker in the Philippines. He is the head honcho and editor-in-chief of SEO Hacker. He does SEO Services for companies in the Philippines and Abroad. Connect with him at Facebook, LinkedIn or Twitter. Check out his new project, Aquascape Philippines