Financial technology, known as FinTech, has transformed the delivery of financial services across the world. In India, FinTech has played a major role in improving financial inclusion by expanding access to banking, payments, credit, and insurance services. This paper examines how digital public infrastructure such as Aadhaar, mobile connectivity, and the Unified Payments Interface has supported inclusive financial growth. It uses government reports, central bank publications, and global financial data to explain progress made in recent years. The paper also discusses key challenges, including digital literacy gaps, cybersecurity risks, gender inequality, and data privacy concerns. While India has achieved remarkable success in increasing account ownership and digital transactions, meaningful usage and consumer protection remain important concerns. The study concludes with policy recommendations to strengthen digital literacy, improve regulatory systems, enhance cybersecurity, and promote responsible innovation. FinTech can continue to advance inclusive development if supported by strong governance, transparency, and public trust.