Webmaster Guidelines are a set of recommendations provided by search engines, like Google, to help website owners improve their site's visibility and performance in search results. These guidelines cover best practices for creating high-quality content, optimizing site structure, and ensuring a positive user experience. Following these guidelines can help websites avoid penalties and improve their ranking. Key aspects include using descriptive titles, providing useful information, and ensuring that the site is mobile-friendly. Adhering to these principles can lead to better search engine results and increased traffic to the site.