Data Cubes are multidimensional arrays of values grouped in cells to compute formulas. Data can be grouped dragging dimensions and dropping them on columns and rows or it can be filtered dropping on coordinates. After that, formulas can be created to compute data.
Conceiving data as a cube with hierarchical dimensions leads to conceptually straightforward operations to facilitate analysis
Sometimes is better to have a 3D engine to identify patterns or to find anomalies in huge amounts of data