The Sentiment Score is a numerical metric returned by the Google Natural Language API, indicating the emotional polarity (positive, negative, or neutral) associated with an entity within a text or query.
Sentiment analysis is crucial for semantic intent classification and competitive analysis. In intent models, positive sentiment associated with transactional entities (e.g., a product) contributes positively to classifying the query as transactional. Furthermore, sentiment analysis of ranked titles, particularly for branded or commercial investigation searches, can be used to uncover potential publisher bias in SERP analysis.