What is Ethereum? The network behind ETH, explained simply

Ethereum is a public blockchain that runs software, and anyone can use it. People build apps on it that work without a bank, a broker, or a company sitting in the middle. Its coin is called ether, ticker ETH, and you spend small amounts of ether to use the network. One way to picture it: Bitcoin works like digital cash, while Ethereum works like a shared computer that anyone in the world can program.

What Ethereum is, in plain terms

Development started well before the launch. Vitalik Buterin, then 19 years old, wrote the first proposal in late 2013 and pitched the idea at a Bitcoin conference in Miami in January 2014. Ethereum went live on July 30, 2015, when its founders mined the first block. Buterin was one of eight co-founders. Among them was Gavin Wood, who wrote the technical spec known as the yellow paper and built Solidity, the language most Ethereum apps still use today.

People sometimes call Ethereum a world computer. That phrase captures the idea well. Instead of one machine you own, it is a single computer spread across thousands of nodes that agree on every step. That design makes it slow and expensive next to a normal server. It also makes it very hard for any one party to censor or shut down.

The official description is dry but worth reading. Ethereum calls itself "a decentralized blockchain network and software development platform, powered by the cryptocurrency ether (ETH)." Strip the jargon and it means this. Thousands of computers around the world keep the same records and run the same programs at once. No single owner. No off switch.

What ether (ETH) is and what it pays for

Ether is the network's built-in money. Ethereum describes it as "digital money you can send to anyone, anywhere in the world in seconds." Every action on the network costs a small fee, and that fee is paid in ether. People call that fee gas. Send ETH to a friend, mint a token, or trade on an app, and each action burns a little gas. The busier the network gets, the more that gas costs.

It also trades as a financial asset. ETH sits second only to bitcoin by market value. On September 30, 2026, ether changed hands near $2,667, with a market cap around $325.64 billion, according to CoinGecko. Those figures move by the hour. Treat them as a snapshot, not a forecast, and never as a reason to buy.

Think of gas like a metered fee. A simple transfer of ETH might cost a few cents when the network is quiet and several dollars when everyone rushes in at once. Actions that ask the network to do more work, like trading through a smart contract, cost more. This is why fees became a sore point during busy periods, and why so much effort has gone into making them cheaper.

Smart contracts and the apps people build

Here is what sets Ethereum apart from a plain payment network. It can store and run code. These small programs are called smart contracts, and Ethereum describes them as "open-source programs" that "run 24/7, globally." A smart contract does exactly what it was written to do, every time it is called, and no one can quietly change it after the fact.

Developers combine these contracts into apps, usually called dapps, short for decentralized applications. Some let you swap one token for another. Others lend and borrow. Many issue stablecoins, the dollar-pegged tokens that settle billions of dollars a day. There is a catch, though. A bug in a contract can be drained by an attacker, and because the code runs exactly as written, a costly mistake can be permanent.

Uses run wide. Decentralized exchanges let people trade without a broker. Lending apps pay interest on deposits and charge it on loans. Artists sell digital collectibles as NFTs. Groups pool money and vote on how to spend it through what are called DAOs. Not everything works, and plenty of projects have failed, but the common thread is code standing in for a middleman.

How Ethereum agrees on what happened: proof of stake

Every blockchain needs a way for strangers who do not trust each other to agree on what happened. Ethereum used to do this through mining, the same power-hungry method Bitcoin still relies on. That approach ended on September 15, 2022, in an upgrade called the Merge. The network switched to a system called proof of stake. According to the Ethereum Foundation, the change cut the network's energy use by about 99.95 percent.

Under proof of stake, people lock up ether for the right to check transactions and add new blocks. Play by the rules and you earn a reward. Cheat, and you lose part of what you staked. The two systems involve real trade-offs around security, cost, and who gets to take part, which we cover in proof of work vs proof of stake.

No single company runs Ethereum, and there is no official count of how many people build on it. The Ethereum Foundation funds some of the work. Much of the rest comes from volunteers, startups, and independent teams scattered across the world, which is a strength and a headache at the same time.

How to hold ether and put it to work

Holding ether starts with a wallet. A wallet does not really store your coins, because the coins live on the blockchain. It stores the keys that prove the coins are yours and let you move them. Lose those keys and you lose access, with no support line to call. Some wallets are apps on a phone. Others are small hardware devices that keep the keys offline.

You can put ether to work by staking it. To run your own validator, the software that secures the network, you need at least 32 ETH and a machine that stays online. Most people do not hold that much. So they use pooled services that accept far smaller amounts, sometimes as little as 0.01 ETH. As of 2026, roughly 43.66 million ETH was staked, about 35 percent of all ether in existence, earning a base rate near 2.5 percent a year, according to Ethereum's own figures.

Pooled staking often gives you a token that stands in for your locked ether, which you can then spend or trade elsewhere. That practice is known as liquid staking, and it has grown quickly. It also adds a layer of risk, because you are trusting the service that issued the token to stay solvent and honest. Our guide to what liquid staking is explains where regulators have started to draw the line.

How Ethereum and Bitcoin differ

People often ask which is better, Ethereum or Bitcoin. The fairer question is what each one is for. Ethereum puts the split plainly on its own site: "Bitcoin is a tool for sending value. Ethereum is a platform for building it."

Bitcoin caps its supply at 21 million coins and keeps its rules deliberately simple. Ethereum has no fixed cap, and it destroys a portion of ether with every transaction, so the total supply can shrink or grow depending on how heavily the network is used. One was designed to be hard money. The other was designed to be flexible. Neither goal is wrong, and they rarely compete for the same job.

The risks and limits worth knowing

Ethereum is capable, but it carries real risks. Fees can jump when the network is congested, sometimes to more than the value of a small payment. Smart contracts can hide bugs, and once funds are stolen, they are usually gone for good. The price of ether can fall hard and fast, and past performance tells you nothing reliable about the future.

Scaling remains unfinished. Much of the day-to-day activity has shifted to layer 2 networks, add-on systems that bundle many transactions together and settle them back on Ethereum for a fraction of the cost. They cut fees. They also introduce fresh bugs and new middlemen of their own, and the technology is still maturing. Anyone using it should keep that in mind.

Rules are still catching up. Governments treat ether differently from one country to the next, and how it is taxed or overseen where you live can change with little warning. None of that is settled. It is worth checking the guidance in your own jurisdiction before you act.