The Microsoft Azure Cognitive Services have been added to the RapidAPI Marketplace, allowing developers to connect to these powerful tools with just one account and API key. These services include Vision, Language, Web Search, and Decision categories, which offer various functionalities such as image analysis, natural language processing, web search, and decision-making capabilities. Developers can subscribe to pricing plans, test APIs using the Endpoints Page, adjust parameters as desired, and integrate the APIs into their applications using the "Copy Code" button or by generating custom code snippets. The Bing News Search API is used in this tutorial, which allows developers to retrieve news articles based on a specified query, with optional parameters such as count and freshness that can be adjusted to refine results.