In this chapter, you will get an overview of how to use the sentiment analysis feature offered by the Azure AI Language service. Azure AI Language is a cloud-based service that provides natural language processing (NLP) features for understanding and analyzing text. NLP can be simply defined as a collection of algorithms, models, and tools that let you process text or speech as structured data so your application can extract meaning, run logic, and produce language-aware outputs. Thanks to NLP, machines can understand, interpret, and generate human language. This service combines linguistics with computer science and machine learning to process and analyze text and speech data. The Azure AI Language service provides a variety of features, and in the previous chapters, we explored language detection as one of them.