Keyword stuffing refers to the excessive repetition of keywords on a webpage in an attempt to improve its SEO. It is an outdated and black-hat SEO technique where words or phrases are unnaturally placed in the text, meta tags, or even the code of a webpage.
Search engines now assess websites based on their user-friendliness and the naturalness of content. Keyword stuffing is not only disregarded by search engines, but it can also lead to a page being penalized in rankings because the practice is seen as an attempt to manipulate search engine algorithms.