The Muslim World refers to countries and regions where Islam is the predominant religion. This includes nations in the Middle East, North Africa, parts of Asia, and even communities in Europe and the Americas. The population of Muslims worldwide is over 1.9 billion, making Islam one of the largest religions. Key cities like Mecca and Medina hold significant religious importance for Muslims. Islamic culture is diverse, encompassing various languages, traditions, and practices. Major sects within Islam include Sunni and Shia, each with unique beliefs and practices. The Quran is the holy book of Islam, guiding the spiritual and moral lives of Muslims around the globe.