Azure Data Lake is a cloud-based storage service provided by Microsoft, optimized for big data workloads and analytics. It allows businesses to store massive datasets in their native format and integrates seamlessly with analytics tools like Azure Synapse Analytics, Databricks, and Power BI. With hierarchical namespace support, fine-grained access control, and built-in security features, Azure Data Lake simplifies data management while enabling high-performance querying and scalable data processing for AI, machine learning, and business intelligence applications.