Keyword Stuffing: Keyword stuffing is a practice designed to manipulate a site's ranking and position in search results, usually targeted at Google.
Because this practice often leads to a negative user experience, it's considered an unethical search engine optimization technique and can lead to a site being banned temporarily or permanently from search engine results.
Examples of keyword stuffing include blocks of text listing city names that the company is trying to target for rankings, or phone number lists that don't add value to content. Keyword stuffing can also include repeating phrases or words so many time in a passage or sentence that it doesn't read naturally. For example:
"We sell custom homes. Custom homes can be customized to fit your custom home needs. Contact a custom home builder in your area to start designing your custom home."
Keyword stuffing can also occur in meta tags, which is likely the reason most search engines now ignore them. Some websites even place text behind images or in a color that matches the background so that visitors don't see it, but search engines do. Mos search engines could easily see through this method by 2005.
Keyword stuffing is an outdated technique that most major search engines can spot easily. Google encourages users to "Focus on creating useful, information-rich content that uses keywords appropriately and in context," instead.