Hajj is one of the five pillars of Islam. It is an obligatory pilgrimage that every adult Muslim who is physically and financially able must perform at least once in his or her lifetime. Hajj is held in the holy city of Mecca, Saudi Arabia, at a specific time. Hajj is mainly performed in the Islamic month of Dhu al-Hijjah and involves several important religious rituals. Notable among these are the Tawaf (circumambulation) of the Kaaba (seven times), the Sa'i (running or walking) between the hills of Safa and Marwa, the standing at the Plain of Arafat, and the symbolic stoning of Satan. Hajj is not just a form of worship, but it is a symbol of unity, equality, and deep devotion to Allah among Muslims. Millions of Muslims from different parts of the world come together in the same clothes and follow the same rules to perform this great act of worship, which further strengthens the brotherhood of Islam.