What is the difference between sentiment classification at the sentence level and at the aspect level?

Sentiment classification at the sentence level determines the overall emotional tone of the entire sentence — for example, positive, negative, or neutral. This is useful when you need to understand the general mood of a statement.

Aspect-based sentiment analysis is more detailed: it identifies specific aspects or characteristics of an object and determines the sentiment for each of them. For example, in a review of a phone, you can separately evaluate the camera, battery, and screen.

Thus, sentence-level classification provides the overall emotional background, while aspect-level classification offers a more targeted analysis of individual characteristics.