Ijtihad refers to independent reasoning and interpretation of Islamic legal sources to derive rulings. While the Prophet Muhammad directly received divine guidance, after his death scholars engaged in ijtihad to apply Islamic principles to new situations. A mujtahid is a qualified legal scholar who performs ijtihad. However, after the Abbasid era, the doors of ijtihad were largely closed. Reviving ijtihad requires liberating religious institutions, reforming education, and allowing collective and collaborative efforts to interpret issues like women's roles, Muslim unity, economics, and citizens living as minorities.