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Cryptocurrencies, led by Bitcoin and Ethereum, are reshaping the global financial system. Once considered a niche asset for tech enthusiasts, cryptocurrencies are now attracting mainstream attention from governments, investors, and businesses. Countries like El Salvador have even adopted Bitcoin as legal tender, while major corporations, including Tesla and Square, have added cryptocurrencies to their balance sheets. The rise of decentralized finance (DeFi) is also challenging traditional banking systems by offering financial services such as lending and borrowing without intermediaries. However, the volatility of cryptocurrencies, regulatory uncertainty, and environmental concerns surrounding energy-intensive mining practices remain significant challenges. As the world grapples with the implications of digital currencies, their potential to democratize finance and disrupt traditional markets continues to grow.