Data Warehouse
A data warehouse is a centralized repository that stores integrated data from multiple sources, optimized for querying and analysis rather than transaction processing. It supports business intelligence (BI) activities by providing a consistent, historical view of data for decision-making. Data is typically structured, cleaned, and transformed through ETL (Extract, Transform, Load) processes to ensure reliability and usability.
Developers should learn about data warehouses when building or maintaining systems for analytics, reporting, or data-driven decision support, such as in e-commerce, finance, or healthcare applications. It's essential for handling large volumes of historical data, enabling complex queries, and supporting tools like dashboards or machine learning models that require aggregated, time-series insights.