Google Panda is a search engine algorithm update introduced by Google in 2011. It aims to improve the quality of search results by penalizing websites with low-quality or thin content, duplicate content, excessive advertising, and poor user experience. Panda evaluates websites based on various factors such as content relevance, originality, and overall user satisfaction. Websites that adhere to high-quality standards are rewarded with higher rankings, while those that violate these guidelines may experience a significant drop in search visibility.