A ‘noindex tag’ is a piece of code that is added to a webpage’s HTML to instruct search engines not to index or include that particular page in their search results. This tag is commonly used by website owners to prevent certain pages from appearing in search engine results, either because they are not relevant or because they contain sensitive information. By using a ‘noindex tag’, website owners can control which pages are visible to search engines, ultimately improving the overall visibility and ranking of their website.