The global cryptocurrency market capitalization has exceeded $4 trillion, marking a significant milestone in 2025. This growth is largely driven by Bitcoin and Ethereum, which continue to lead the market. Bitcoin's status as a digital store of value and Ethereum's dominance in DeFi, NFTs, and smart contracts have reinforced their market positions. Institutional inflows, favorable regulations, and the adoption of crypto financial products are key contributors to this surge. The milestone highlights the rapid expansion of the crypto industry and growing mainstream investor interest, although analysts caution about the inherent volatility of digital assets.