In addition to indexing the visible, legible text of a webpage, some search engines will also Index the Hidden Text that is written in the form of hidden tags, or comment tags. You may improve your Ranking on some engines by including some or all of your keywords as hidden text, hidden within these comment tags. Remember to only use text that a user can see in his browser.Many (but apparently not all) of the major search engines now have a policy against this type of technique, and have set up their indexing programs to check for it. When spotted, the Penalty can range anywhere from ignoring the text, to refusing to index the page at all, or even worse. This type of practice is now regarded as Spam by most of the search engines and we highly recommend avoiding it.