Language mismatch occurs when the language specified in the HTML lang attribute or content metadata does not match the actual language used on a webpage. Language inconsistencies can confuse search engines and affect the interpretation, indexing, and ranking of web content for language-specific queries. Search engines like Google rely on language signals to determine the language relevance and targeting of webpages, so language mismatch can lead to misclassification or deprioritization of content in search results. Webmasters should ensure that the specified language matches the primary language of the webpage's content to improve search engine visibility and language targeting. To address language mismatch issues, webmasters should specify the correct language code in the HTML lang attribute, use language-specific meta tags such as , and provide language annotations in structured data markup for multilingual webpages. They can also monitor search appearance and index coverage in Google Search Console for language-specific search queries and performance metrics.