Azure Cognitive Search is a cloud-based search service provided by Microsoft Azure that enables developers to integrate powerful search capabilities into their applications. It allows users to create rich search experiences by indexing various types of content, such as documents, images, and databases, making it easier to find relevant information quickly. The service supports advanced features like full-text search, faceted navigation, and filtering, which enhance the search experience. Additionally, Azure Cognitive Search can leverage AI capabilities to extract insights from unstructured data, improving the relevance of search results and enabling users to discover information more effectively.