Ubu ni ubwoko bwo gusibanganya ahantu hahanamye cyane, kubera itandukaniro ryimikorere ya molekile yimikorere yubusa, byakorewe mubikoresho byangiza ubushyuhe cyangwa uburyo bwo gutekesha ibintu byinshi byo gutobora no kweza.Ibikoresho bigufi bikoreshwa cyane cyane mubimiti, imiti, peteroli, ibirungo, plastike, amavuta nindi mirima.