The world computer
The Ethereum guide.
The programmable blockchain behind DeFi, NFTs and the app layer of crypto. From the 2015 launch to the Merge and beyond, here is Ethereum in plain language.
Reviewed and current as of September 12, 2026
01What Ethereum is
Ethereum is a programmable blockchain: a global computer that anyone can build on. Developers publish apps, stablecoins and financial tools to it, and the network runs them exactly as written. Ether, or ETH, is the fuel that pays for every computation.
Where Bitcoin set out to be digital money, Ethereum set out to be digital infrastructure. That difference made it the home base for DeFi, NFTs and the experiments that followed.
02Smart contracts in plain words
A smart contract is an agreement written as code and stored on the blockchain. It holds funds, follows its own rules, and executes by itself when the conditions are met. Lending pools, token sales and artist royalties all run on smart contracts, carrying out deals directly between the parties.
Think of a vending machine: insert the coins, make a selection, and the machine delivers, the same result every time, with the middleman designed out.
03From the 2015 launch to the Merge
Vitalik Buterin proposed Ethereum in late 2013, and the network went live on July 30, 2015. Developers arrived quickly, and the years that followed brought the first token booms, the rise of DeFi, and the NFT wave.
The biggest upgrade arrived on September 15, 2022. Called the Merge, it swapped Ethereum's mining based consensus for proof of stake, where validators lock up ETH to secure the network instead of racing computers. Energy use fell by more than 99 percent, and the stage was set for cheaper scaling.
04Gas, simply explained
Every action on Ethereum costs gas, a fee measured in tiny units called gwei. Simple transfers sip gas; complex contract calls drink more. When the network is busy, users bid higher to jump the queue, and quiet hours bring bargains.
Gas goes to the validators keeping the network running, and a slice of every fee gets burned, permanently trimming supply. Busy network, steady burn.
05Layer 2s in one paragraph
Layer 2 networks like Arbitrum, Optimism, Base and zkSync handle transactions off the main chain, then settle the results back to Ethereum. Users get faster confirmations and fees measured in cents, while Ethereum's security stands guard underneath. Most everyday activity is migrating to these layers, leaving the main chain as the trusted settlement foundation.
06Keep learning on this site
The glossary explains gas, staking, rollups and every other term in plain language. The history chart shows how ETH price milestones lined up with the upgrades. And the Daily Brief keeps you current on what the builders ship next, every morning.
01What is ether (ETH)?
Ether is the native currency of Ethereum. It pays for gas, secures the network through staking, and serves as the most widely used collateral in DeFi. Think of ETH as fuel, security deposit and pristine collateral in one asset.
02How is Ethereum different from Bitcoin?
Bitcoin was built to be sound digital money. Ethereum was built to be a platform anyone can build on. Both run on open networks with fixed rules, and they complement each other: Bitcoin anchors value while Ethereum hosts the applications.
03What was the Merge?
The September 2022 upgrade that moved Ethereum from mining to proof of stake. Validators replaced miners, energy use dropped by more than 99 percent, and ETH issuance fell sharply. It stands as the network's biggest technical achievement to date.
04Why does gas cost change so much?
Gas follows demand. Busy periods bring bidding wars for block space; quiet hours bring low fees. Layer 2 networks now carry most everyday traffic at a fraction of the cost, which keeps the main chain calm for high value settlement.
05Is there a limit on how much ETH can exist?
Ethereum runs an open supply schedule: new ETH goes to stakers as rewards, while a slice of every transaction fee gets burned. When network activity runs hot, burning can outpace issuance and supply gently shrinks.