Hidden Text is an old form of Black Hat SEO that involves hiding keywords within a webpage. These keywords cannot be seen by the users, but can be seen by crawlers. This is a practice that is penalized by Google, and can now be easily detected.
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