You need to measure the public perception of your brand on social media messages. Which Azure Cognitive Services service should you use?

The Text Analytics service, now part of the Azure AI Language service, is designed for natural language processing tasks on raw text. Its Sentiment Analysis and Opinion Mining features are specifically built to evaluate text and determine if the sentiment is positive, negative, neutral, or mixed. This directly addresses the requirement of measuring public perception of a brand by analyzing social media messages for opinions and feelings.

B. Content Moderator: This service is used to detect potentially offensive, risky, or undesirable content (text, images, video), not to analyze the positive or negative sentiment for brand perception.

C. Computer Vision: This service analyzes the content of images and videos. It is not designed to process and understand the sentiment within text-based social media messages.

D. Form Recognizer: This service, now Azure AI Document Intelligence, is used to extract text, key-value pairs, and tables from documents and forms, not for analyzing sentiment in unstructured text.

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1. Microsoft Azure AI Language Documentation. "What is sentiment analysis and opinion mining in Azure AI Language?". This document explicitly states, "These features help you find out what people think of your brand or topic by mining text for clues about positive or negative sentiment...". This directly supports the use of Text Analytics (Language service) for the described scenario.

Source: Microsoft Learn, Azure AI Language documentation, "Concepts" section.

2. Microsoft Azure AI Content Safety Documentation. "What is Azure AI Content Safety?". The documentation defines the service's purpose: "Azure AI Content Safety is a content moderation service that helps you detect user-generated and AI-generated content... that is harmful or otherwise objectionable." This confirms its focus is on moderation, not sentiment analysis.

Source: Microsoft Learn, Azure AI Content Safety documentation, "Overview" section.

3. Microsoft Azure AI Vision Documentation. "What is Computer Vision?". The official documentation states, "The Azure AI Vision service gives you access to advanced algorithms that process images and return information based on the visual features you're interested in." This clarifies its purpose is for visual, not textual, analysis.

Source: Microsoft Learn, Azure AI Vision documentation, "Overview" section.

4. Microsoft Azure AI Document Intelligence Documentation. "What is Azure AI Document Intelligence?". The service is described as one that lets you "build automated data processing software... to extract text, key-value pairs, tables, and structures from your documents." This highlights its function for structured data extraction from documents, not sentiment analysis of social media posts.

Source: Microsoft Learn, Azure AI Document Intelligence documentation, "Overview" section.