Gucana icyuma ni uburyo bwo gukora ibyuma bugezweho kandi bunoze bukoreshwa mu gukora ibice by'icyuma bigoye, bishobora gusubiramo, kandi bifite ingano nyinshi. Bukoreshwa cyane mu modoka, ibikoresho by'ikoranabuhanga, ibikoresho by'inganda, n'ibicuruzwa bikoreshwa aho imbaraga, ubuziranenge, n'ubwiza bw'ubuso ari ingenzi cyane.