Last Updated: March 2026
Ethereum is more than just a cryptocurrency — it’s a programmable blockchain that runs applications. But how does Ethereum actually work? This guide explains Ethereum’s mechanics in simple terms.
Ethereum in 30 Seconds
Ethereum is a global computer. Instead of running software on one company’s servers (like Google or Amazon), Ethereum runs code on thousands of computers worldwide simultaneously. Anyone can deploy a program (smart contract) on Ethereum, and it runs exactly as written — no one can change, censor, or shut it down. See blockchain guide.
Key Concepts
Smart Contracts
Programs that execute automatically when conditions are met. They power DeFi lending, DEX trading, NFTs, and everything else on Ethereum. See smart contract guide.
Gas Fees
Every computation on Ethereum costs “gas” — a fee paid in ETH. Simple transfers are cheap; complex DeFi transactions cost more. Gas prevents spam and compensates validators. See gas guide.
Proof of Stake
Since The Merge (September 2022), Ethereum uses Proof of Stake. Validators lock 32 ETH as collateral to verify transactions and earn rewards. This replaced energy-intensive Proof of Work mining. See PoS guide and staking guide.
EVM (Ethereum Virtual Machine)
The computing environment where smart contracts run. Every Ethereum node runs the EVM, ensuring all nodes reach the same result. “EVM-compatible” chains (Arbitrum, Base, Polygon, BNB Chain) can run the same smart contracts as Ethereum. See L2 guide.
Layer 2 Scaling
Ethereum processes ~15 TPS on its base layer. Layer 2 rollups (Arbitrum, Optimism, Base) bundle thousands of transactions off-chain and post summaries to Ethereum, achieving 1,000+ TPS at cents per transaction. This is Ethereum’s scaling strategy. See L2 guide.
ETH as Money
- Gas payments: Every Ethereum transaction requires ETH for fees
- Staking: 32 ETH required to run a validator; liquid staking for any amount. See ETH staking
- DeFi collateral: ETH is the most-used collateral in DeFi. See DeFi guide
- Deflationary: EIP-1559 burns ETH on every transaction. When burn rate exceeds issuance, ETH supply decreases. See burn guide
Ethereum vs Bitcoin
Bitcoin = digital gold (store of value, fixed supply). Ethereum = digital economy (programmable, powers DeFi/NFTs/Web3). See full comparison.
Getting Started with Ethereum
- Buy ETH. See buying guide
- Set up MetaMask. See MetaMask guide
- Try DeFi on an L2 (cheaper). See Uniswap guide
- Stake for yield. See staking guide
Frequently Asked Questions
Is Ethereum safe?
The Ethereum network has never been hacked. Security risks come from smart contract bugs in individual dApps, not Ethereum itself. See security guide.
Why are Ethereum fees so high?
High demand for limited block space drives fees up. Solution: use Layer 2 networks for 100x cheaper transactions. See gas guide and L2 guide.
Is Ethereum safe to invest in?
Ethereum is the second-largest crypto with a proven track record. However, like all crypto, it is volatile.
