Ivyuma vy’ivyuma ni ikintu c’icuma gikozwe mu bipande vy’ivyuma vy’ivyuma vy’ivyuma vy’ivyuma, ivyo bikaba bizunguruka biciye mu gukora amashamba, hagati, no guheza insyo, hanyuma hakurikirwa no guteka, gupfukwa n’ibindi. Ivyuma vy’ivyuma bikoreshwa cane mu kwubaka, mu gukora imodoka, no mu bikorwa vyo mu nzu. Irangwa n’ukuri kw’ingero nyinshi, uburyo bwiza cane bwo ku ruhande, n’ubushobozi bwo gukora neza, uburemere bw’ibintu, n’ubushobozi bwo gusudira.