Entity Salience is the importance or prominence of an entity within a piece of content or search system interpretation.
It matters because search behavior is becoming more conversational and answer-driven. Clear, authoritative, well-structured content gives both users and AI systems a better chance of understanding and referencing your brand accurately.
Example
An article about electric bicycle batteries mentions several brands in passing but focuses on battery care. Entity salience concerns that prominence in context; it should not be presented as a universal score every search engine exposes.