A data warehouse is a centralized repository that allows data analysts to access and analyze data from multiple sources. It is important for data analysts to learn about data warehousing because it enables them to effectively collect, store, and manage large amounts of data, making it easier for them to perform data analysis and generate insights that can inform business decisions.

Additionally, data warehousing allows data analysts to access and analyze data in real-time, which can provide up-to-date information that can be used to make time-sensitive decisions.