The primary function of a data warehouse is to consolidate and store vast amounts of data from various sources, enabling efficient querying and analysis. Data warehouses facilitate the extraction, transformation, and loading (ETL) of data to ensure consistency and reliability. By organizing data in a structured format, they support business intelligence and reporting activities, allowing organizations to derive insights from their data. Data warehouses empower decision-makers with historical and current data analysis, leading to better-informed strategic decisions.