Data warehousing is the process of collecting, storing, and managing large volumes of structured and unstructured data from multiple sources in a centralized repository. This repository, known as a data warehouse, is designed to support business intelligence (BI) activities, including data analysis and reporting. The data is typically extracted from various operational systems, transformed into a consistent format, and then loaded into the warehouse, a process often referred to as ETL (Extract, Transform, Load). Data warehousing enables organizations to perform complex queries and generate reports that provide valuable insights, helping businesses make informed decisions, optimize operations, and identify trends. It plays a critical role in enabling data-driven decision-making across departments.