Box projections (aka cube mapping) are an extension of XYZ To UVW mapping. The projection of the cube's planes are based on the surface's normal direction. Box projections provide a quick way to map a Texture on any Object without too much distortion, but the seams between the box's Projection planes may be visible in the render, depending on the surface's shape.
Figure 1: Several simple shapes using Box projections to map a Texture to their surface