Decentralized Finance (DeFi) has emerged as a transformative force reshaping traditional financial systems by leveraging blockchain technology, smart contracts, and decentralized applications. Unlike conventional financial institutions, DeFi platforms operate without intermediaries, offering transparency, global accessibility, and programmable financial services such as lending, borrowing, trading, and yield farming. This paper explores the foundational concepts of DeFi, its core technologies, and its disruptive potential within the existing financial ecosystem. The study also analyzes current trends, regulatory challenges, and future directions for DeFi, highlighting its role in promoting financial inclusion, reducing costs, and enabling peer-to-peer transactions on a global scale. While DeFi holds immense promise, it also presents risks, including security vulnerabilities, governance issues, and legal uncertainty. This research underscores the necessity for adaptive regulation and innovation to harness DeFi’s benefits while mitigating its drawbacks, ultimately offering a balanced perspective on its impact as a paradigm shift in global finance.