Keyword density refers to the percentage of times a specific keyword or phrase appears within a web page s content compared to the total number of words on that page. It is a metric commonly used in search engine optimization (SEO) to gauge how relevant a page is for a particular search term. While maintaining an appropriate keyword density can help improve a page s visibility in search results, overusing keywords known as keyword stuffing can harm rankings and degrade user experience. Most SEO experts recommend focusing on natural, reader-friendly content rather than strictly adhering to a specific keyword density percentage.