Islamic banking is a modern banking system based on Islamic legal concepts that uses risk-sharing as its main method, excluding interest-based financing. This document discusses the definition of Islamic banking, its internationalization in countries like Indonesia, Brunei, and Singapore, its establishment in Pakistan in 2004, and five main sources of Islamic finance - Mudaraba, Musharka, Murahaba, Ijara, and Sukuk. It also outlines major challenges faced by the industry related to financial innovation and risk, global economic integration, and developing consistent accounting and auditing standards.