Cylindrical projection wraps texture maps on a surface with a cylindrical shape. Cylindrical projection provides a quick way to map a texture on roughly cylindrically shaped surfaces without too much distortion. However the seams of the texture may be visible in the render depending on the shape of the surface. Figure 1 shows the result of using Cylindrical projection on some simple surfaces.
Figure 1: Several simple shapes using Cylindrical projection to map a texture to their surface.