Mai kwangila yana nufin mutum ko kamfani wanda wani ɗan kwangila ya ɗauka don yin takamaiman aiki ko samar da wani sabis na musamman a matsayin wani ɓangare na babban aiki. Mai kwangila yawanci ba abokin ciniki ko babban ɗan kwangila ke aiki kai tsaye ba amma yana aiki ƙarƙashin yarjejeniyar kwangila tare da ɗan kwangila. Dan kwangilar ne ke da alhakin kammala aikin da aka ba shi ko kuma samar da sabis ɗin da aka yi kwangila a cikin sharuɗɗan da aka amince da su.