This year marks the 105th anniversary of the founding of the Communist Party of China. From just over 50 members in 1921 to more than 100 million today, the CPC has led one of the most remarkable transformations in modern history, turning China into the world's second-largest economy and a major force in global affairs. What explains the Party's remarkable longevity and governing capacity? How has it continued to adapt through profound changes at home and abroad? And as China enters a new stage of development, what challenges and opportunities lie ahead for the world's largest ruling party?