Entity Salience in SEO and NLP (Natural Language Processing) refers to the importance or relevance of entities (such as people, places, organizations, concepts) within a content piece relative to the main subject matter. It helps search engines understand the context and significance of different entities in text, improving content categorization and search relevance. High-salience entities are closely related to the core topics and can significantly influence content ranking and visibility. Understanding and optimizing for entity salience can enhance SEO strategies by aligning content more closely with user intent and search queries.