What is the difference between a Data Lake and a Data Warehouse, and when would you use each in analytics?

A Data Lake stores raw, unstructured data, ideal for flexible, exploratory analysis. A Data Warehouse stores structured, processed data for specific reporting and querying. Use a Data Lake for big data and real-time analytics, and a Data Warehouse for structured reporting. For example,Data Lake: Storing sensor data; Data Warehouse: Sales data for reporting.