A data warehouse is a a federated data management system that centralises and consolidates large amounts of data from multiple sources.
It integrates data from multiple heterogeneous sources to support analytical reporting, structured/ad-hoc queries, and decision making.

Data warehousing involves data cleaning, data integration, and data consolidations and often contains large amounts of historical data
Over time, it builds a historical record that can be invaluable to data scientists and business analysts. Because of these capabilities, a data warehouse can be considered an organisation’s single version of truth.

It is designed to support business intelligence capabilities,analytics etc generally to produce business insights.