Ethereum is a decentralized blockchain platform that enables smart contracts and decentralized applications (dApps) to run without downtime, censorship, or third-party interference. Launched in 2015 by Vitalik Buterin and a founding team including Gavin Wood and Joseph Lubin, Ethereum expanded on Bitcoin vision by creating a general-purpose programmable blockchain. It is the second-largest cryptocurrency by market capitalization and the foundation of the DeFi, NFT, and DAO ecosystems.
Key Takeaways
- Ethereum is a programmable blockchain that runs smart contracts and dApps
- Smart contracts are self-executing code that eliminates intermediaries
- ETH is the native asset used for transaction fees and network security
How Is Ethereum Different from Bitcoin?
While Bitcoin focuses on being digital money with a fixed supply, Ethereum is a programmable world computer. Developers can build and deploy applications on top of it using smart contracts — self-executing code that runs exactly as programmed without possibility of censorship, fraud, or third-party interference. This fundamental difference makes Ethereum a platform while Bitcoin is a single-purpose asset. Bitcoin has a strict 21 million coin cap and is designed for simple value transfer. Ethereum has no supply cap (though fee burning can make it deflationary) and prioritizes computational flexibility over fixed monetary policy.
What Are Smart Contracts?
Smart contracts are programs stored on the Ethereum blockchain that automatically execute when predetermined conditions are met. Think of them as vending machines — you send the correct input (payment), and the machine automatically dispenses the output (service, token, or asset) without needing a human operator. Smart contracts power everything from decentralized exchanges like Uniswap that settle trades without a central order book, to lending protocols like Aave that match borrowers and lenders algorithmically, to NFT marketplaces like OpenSea that handle royalties and transfers programmatically. They are transparent, auditable, and permissionless.
What Is Ether (ETH)?
Ether (ETH) is the native cryptocurrency of the Ethereum network. It serves two primary purposes: paying for transaction fees (gas) and computational services, and securing the network through staking. Validators stake 32 ETH to participate in consensus and earn rewards. ETH is also used as the base trading pair on DEXs, collateral in lending protocols, and the primary asset in DeFi. Unlike Bitcoin fixed supply, ETH supply changes based on network activity — EIP-1559 burns a portion of fees, potentially making ETH deflationary during high usage periods.
What Is the Ethereum Ecosystem?
The Ethereum ecosystem includes thousands of applications across DeFi (Uniswap, Aave, MakerDAO, Curve), NFTs (OpenSea, Blur, Art Blocks), DAOs (Uniswap DAO, MakerDAO, ENS), gaming (Decentraland, Axie Infinity), identity (ENS domains), and infrastructure (Chainlink oracles, The Graph indexing). Layer 2 scaling solutions like Arbitrum, Optimism, and Base extend Ethereum capacity while inheriting its security. Total value locked in Ethereum DeFi protocols exceeds $50 billion, making it the most economically active blockchain in the world by a wide margin.
Frequently Asked Questions
What can I build on Ethereum? Anything from DeFi protocols and NFT marketplaces to DAOs, gaming applications, identity systems, supply chain trackers, and decentralized social networks.
Is Ethereum expensive to use? L1 fees vary with congestion — can be $1-50+ per transaction during peak times. Layer 2 solutions offer fees under $0.01, making Ethereum usable for everyday transactions.
Who controls Ethereum? No single entity. Changes go through Ethereum Improvement Proposals (EIPs) with community consensus. Vitalik Buterin provides vision but has no special control over the network.
Related: What Is Bitcoin? | What Is DeFi?
