Cloaking in SEO refers to the practice of presenting different content to search engines and users in order to manipulate search engine rankings. This is done by using deceptive techniques such as showing search engines one version of a webpage while showing users a different version, or by hiding text or links on a webpage. Cloaking is considered a violation of search engine guidelines and can result in penalties or even removal from search engine results. It is important for websites to provide consistent and relevant content to both search engines and users in order to maintain a strong online presence and avoid being flagged for cloaking.