A crystallographic etching technique has been used to demonstrate that deformation banding is an important deformation mode in copper. In a cold-rolled coarse-grained copper, deformation banding occurs and the different banding geometries divide the grains into a large number of regions with different orientations. Because of the important effect on microstructure, deformation banding is considered to influence the development of deformation texture. In particular, the {110}⟨112⟩ texture component, an important component of the copper-type rolling texture which cannot be explained by existing deformation models, is shown to be formed by deformation banding.