Entities help structure content better by turning language into a mathematical computation, allowing search engines to properly identify concepts and map relationships appropriately. Traditional search models simply can’t perform as well. Google is discovering how to include entity related information in search results through augmentation queries and more. This may include optimizing your web content for Google's Knowledge Graph and Knowledge Panel inclusion. An entity isn’t constricted by language or spelling, instead, it identifies a universally understood concept or thing. Basically, an entity is its relation to other entities. Google relies in part on nodes and edges to explain entities used in structured data and semantic search.