Deliberate repetition of keywords in a page by using invisible or tiny text to increase keyword density. This is banned by search engines.
The mindless repetition of a keyword in tiny letters (or the use of "invisible keywords") on a web page to manipulate search engine positioning. Note: Most search engines and directories penalize keyword spammers with a lower placement or with removal from their databases.
The repetitive usage of keywords or phrases on a single page using hidden text in order to have a high keyword density. Not accepted by search engines.