This is one of the frequently asked questions in Business Intelligence Interviews. A dimensional model is a data model used to organize and store data in a data warehouse. It is based on the idea of organizing data into fact tables and dimension tables. Fact tables contain quantitative data, such as sales and profits, while dimension tables contain descriptive attributes, such as customer and product information. Dimensional modeling is used to support fast querying and data analysis, particularly in online analytical processing (OLAP).