Amazon Comprehend is a natural language processing (NLP) service that uses machine learning to analyze your text. Amazon Comprehend identifies the language of the text, extracts key phrases, places, people, brands, or events, understands sentiment about products or services, and identifies the main topics from a library of documents. The service learns from a variety of information sources, including product descriptions and consumer reviews and it retrains against new data constantly to keep pace with the evolution of language. Because of the depth and breadth of this training approach, it is able to provide accurate coverage for a wide range of scenarios like analyzing customer feedback, intelligent document search, and automatically organizing content.