Ubwoya bw'imyenda ni ubwoko bw'imyenda iboheye hamwe n'into ntoya.Ihambiriye ku mashini nini izenguruka, hanyuma irangi irangi, irasukurwa, irashwanyaguzwa, ikogoshesha, ikoronizwa kandi ikurikirana ibintu bigoye, amaherezo ikora umwenda w'ubwoya bwa polar.