Search Entity Optimization focuses on improving a website's visibility and rankings through the optimization of entities—people, places, things, concepts, and other categories recognized and categorized by search engines. It involves structuring data on a website in a way that search engines can easily understand and relate to other data points, enhancing the entity's presence in search results. This approach is integral to semantic SEO, where the aim is to align content more closely with user intent and the interconnectedness of information on the web.