Data warehousing is a process of collecting, storing, and managing data from various sources for the purpose of analysis and reporting. It involves extracting data from different databases, transforming and organizing it into a centralized database or data warehouse for easier access and analysis. Data warehousing enables businesses to make informed decisions by providing a comprehensive view of their data and making it easier to identify trends and patterns. It also helps in improving data quality, making data more reliable and consistent for analysis. Overall, data warehousing plays a crucial role in data management and business intelligence.