All Praise is due to Allah, and blessings and peace be upon the Messenger of Allah, His Family, Companions and His Followers to the Day of Resurrection. One of the major issues in Islam which many Muslims have a lot of arguments about is the issue of “Hijab”. These arguments occur because of two reasons, namely: 1) the lack of complete understanding of this issue and 2) the lack of knowledge or ignorance of the proofs of the obligation of “Hijab” in the Qur’an and the Sunnah. In this booklet, I tried, with the help of Allah, to put together all these arguments among Muslims on the issue of “Hijab” in focus. First, I gave the exact definition of the word “Hijab” in its correct meaning in the Arabic ******** and cited some Ayaat (Verses) from the Qur’an to show how Allah I the Almighty uses the word and thus makes its meaning more clear for the understanding of all Muslims. Second, I cited the proofs of the obligation of “Hijab” in the Qur’an and the Sunnah (using the translation of the meaning of the Noble Qur’an by Dr. Al-Hilali and Dr. Khan). Third, I listed the proofs of those who claim the legality of exposing the woman’s face and then, I stated the corresponding explicit answers based on the Qur’an and the authentic Sunnah to disprove their claim. With this presentation, I hope that Muslims all over the world will come to agreement and unity instead of argument and/or misunderstanding if not falling into disputes. After all, Islam is a divine message that calls the whole mankind to the worship of One God, Allah I the Almighty. Such worship, which includes, obedience to Allah’s Law (like the obligation to wear “Hijab” for women) must be based on the Qur’an and the authentic Sunnah of Prophet Muhammad r. Let us always be guided by the following Qur’anic verses to obey Allah I and His Messenger r, Allah said which meaning of is translated as: “ But no, by your Rubb (Lord), they can have no Faith, until they make you (O Muhammad r) judge in all disputes between them, and find in themselves no resistance against your decisions, and accept (them) with full submission.” (4:65) "It is not for a believer, man or woman, when Allah and His Messenger have decreed a matter that they should have any option in their decision. And whoever disobeys Allah and His Messenger he has indeed strayed into a plain error.” (33:36) “O you who believe! Obey Allah, and obey the Messenger (Muhammad r) and render not vain your deeds.” (47:33)