This article explores the concept of Decentralized Finance (DeFi), which emerged alongside the rise of cryptocurrencies, blockchain technology, and smart contracts. It aims to create an open and transparent financial system that operates without intermediaries or central authorities. This system relies on blockchain-based applications and protocols that offer traditional financial services—such as deposits, lending, and trading—directly between users. DeFi is characterized by several advantages, most notably high transparency, global accessibility, reduced reliance on traditional financial institutions, and the use of smart contracts to execute transactions automatically. It is utilized in various fields, including lending, borrowing, asset trading, and financial derivatives, opening new opportunities for investors and startups to access funding more easily. However, this system faces challenges such as slow blockchain networks, potential user errors, and a less intuitive user experience compared to traditional systems. Despite these challenges, DeFi represents a significant shift in the financial world due to its ability to provide innovative and more open financial solutions to users worldwide.