A data warehouse is a centralized storage system that collects and organizes large amounts of data from various sources. It allows businesses to store historical data in a way that makes it easy to analyze and retrieve. This helps companies make informed decisions based on trends and patterns found in their data. In a data warehouse, data is often structured and optimized for reporting and analysis. Tools like Business Intelligence (BI) software can be used to visualize this data, enabling users to create dashboards and reports. By using a data warehouse, organizations can improve their efficiency and gain valuable insights into their operations.