Sentiment about a product or a service offered by a company is all too valuable in this era than ever before. Knowing whether their established customer base and potential customers are showing a positive or negative sentiment (as shown in Figure 7-1) toward their product or service can be game-changing for companies. However, extracting the true sentiment from a phrase written in English is a challenge, let alone in all the languages. That’s because human languages could be ambiguous, and we can be sarcastic at time and understanding sarcasm is a huge challenge for computers. Although we are getting better with each passing year, but it is still a long way to go.