SEO over-optimization, also known as keyword stuffing, is the practice of excessively and artificially optimizing a website or webpage for search engines in an attempt to manipulate its ranking. This often involves using an excessive amount of keywords, irrelevant content, and other tactics that go against search engine guidelines. While SEO is important for improving visibility and driving traffic, over-optimization can result in penalties from search engines and ultimately harm the overall user experience. It is important to strike a balance between optimizing for search engines and creating valuable and relevant content for users.