In the online world where users demand relevant and timely results, site search user experience (UX) needs to be more than just a basic search bar. A well-designed site search can drive conversions, engagement, and provide valuable insights. The key best practices for an effective site search include making the search box intuitive, analyzing search data, optimizing search for various devices, providing helpful navigation tools, enhancing the results page, and offering voice search capabilities. Examples of successful site searches include LegalZoom's advanced crawler for indexing legal information efficiently and Coursera's mobile-friendly search with search-as-you-type capabilities.