ما هو الفرق في الأداء بين صلاة السنة والفرض؟

The obligatory prayer (fard) and the supererogatory prayer (nafilah) are generally equal in the conditions of prayer, except in specific matters: Standing (qiyam) is a pillar in the obligatory prayer and not obligatory in the supererogatory prayer; facing the Qiblah is a condition in the obligatory prayer, while a traveler is permitted to pray the supererogatory prayer on his mount; and prostration of forgetfulness (sujud al-sahw), where the Malikis differentiate between it in the obligatory and supererogatory prayers.