Azulejo (Portuguese: [ɐzuˈle(j)ʒu, ɐzuˈlɐjʒu], Spanish: [aθuˈlexo]; from the Arabic الزليج, al-zillīj) is a form of Iberian painted tin-glazed ceramic tilework. They are an ornamental art form, but also had a specific function, such as aiding temperature control in homes.