The Islamic world is linguistically and ethnically diverse, with Arabic, Turkish, Farsi, and Malay spoken across West Asia, Central Asia, Southeast Asia, and Africa. While Arabic is the language of the Quran, it exists in many distinct dialects closer to separate languages. Islam originated in the 7th century AD in the Arabian Peninsula under the prophet Muhammad. The religion's core beliefs are the five pillars of faith, and its doctrines are derived from the Quran and the hadith. Islam subsequently spread rapidly through conversion, trade, and military conquest across three continents. The Islamic world today continues to grapple with issues of secularism, religious extremism, and geopolitical conflicts.