A data warehouse is a centralized repository that stores large amounts of structured and unstructured data from various sources. It is designed to facilitate reporting and analysis, allowing organizations to make informed decisions based on historical data. Data is typically extracted, transformed, and loaded (ETL) into the warehouse, ensuring it is organized and accessible for users. Data warehouses support business intelligence activities by providing a platform for querying and analyzing data. They often integrate with data visualization tools and analytics software, enabling users to generate insights and reports. This helps businesses identify trends, track performance, and optimize operations.