Azure Bot Service is a cloud-based platform provided by Microsoft that enables developers to create, test, and deploy intelligent chatbots. It offers a range of tools and services that simplify the development process, allowing bots to interact with users across various channels like websites, mobile apps, and messaging platforms. The service supports integration with Microsoft services such as Azure Cognitive Services, which enhances bots with natural language processing and machine learning capabilities. This allows bots to understand user queries better and provide more accurate responses, improving overall user experience and engagement.