What is a keyword stuffing?

Publication date : 16 June 2021 • Updated 6 December 2021.
Keyword stuffing is an SEO technique that consists in over-optimizing the content of a web page (textual content, Title tags, Meta Description, Hn) to improve the visibility and ranking of a site.
This black hat seo practice can be considered as spam and the visibility of the site can be penalized by search engines.