Dan kwangila shine mutum ko kamfani wanda ya yarda ya samar da kaya ko ayyuka ga wani bangare a karkashin sharuddan kwangila. A wasu kalmomi, ɗan kwangila shine wanda aka ɗauka don yin takamaiman aiki ko samar da wani samfur ko sabis don musanyawa don biyan kuɗi. Kwangilar kwangilar yawanci tana zayyana iyakokin aiki, lokacin kammalawa, sharuɗɗan biyan kuɗi, da duk wasu cikakkun bayanai masu dacewa. 'Yan kwangila za su iya yin aiki a cikin masana'antu daban-daban, ciki har da gine-gine, injiniyanci, IT, da shawarwari.