Bitcoin (BTC) and Ethereum (ETH) are the two largest cryptocurrencies by market cap, but they serve different purposes. Bitcoin was created in 2009 as a decentralized digital currency and is often seen as "digital gold" — a store of value. Ethereum, launched in 2015, is more than a currency; it’s a decentralized platform for building smart contracts and dApps (decentralized applications). BTC focuses on security and simplicity, while ETH enables complex, programmable transactions. Ethereum is transitioning to a more energy-efficient proof-of-stake model, while Bitcoin remains on proof-of-work. Both have strong communities and development teams, but BTC is often favored by investors, while ETH attracts developers. Each has a unique role in the evolving world of blockchain and Web3