In the previous chapter, you started looking into sentiment analysis and implemented your first sentiment analyzer using a lexicon-based approach. Recall that sentiment analysis is concerned with the automated detection of sentiment (usually along two dimensions of positive and negative sentiments) for a piece of text. It is a popular task to apply to such opinionated texts as, for example, reviews on movies, restaurants, products, and services. A good sentiment analyzer may help save the user a lot of time!