Which AWS service provides a powerful tool for natural language processing (NLP)?

Amazon Comprehend is designed specifically for natural language processing (NLP) tasks. It helps in analyzing and understanding text by identifying the language, sentiment, entities, key phrases, and topics contained within the text. This service can be utilized to extract valuable insights from unstructured data, such as documents and social media content, making it a crucial tool for applications that require an understanding of human language.

In contrast, Amazon Rekognition is focused on image and video analysis, enabling functionalities such as facial recognition and object detection. Amazon Lex is a service for building conversational interfaces and chatbots, which incorporates some NLP capabilities, but its primary function is to facilitate natural language understanding and automatic speech recognition. Amazon Polly converts text into lifelike speech, which is useful for creating engaging audio content but does not specifically address NLP tasks in the same way that Amazon Comprehend does.