Integration in data warehouses is the process of combining different sets of data from various sources into a single source of information. This allows for organizations to have a unified view of their data, allowing them to gain valuable insights and make better decisions. Integration involves merging multiple sets of data together in order to create an integrated version of the totality of knowledge. Integration also helps reduce manual input and thus, reduce errors, allowing organizations to trust their data more and use it with confidence. All these help businesses streamline their operations, reduce costs, and improve decision-making capabilities.