Ethereum is a blockchain that runs programs, not just payments. Developers deploy code called smart contracts on it, and those contracts run exactly as written without any company in control. Its native coin, ether (ETH), pays the fees for every action on the network. Most of DeFi, NFTs, stablecoins and airdrops grew up on Ethereum, which is why people call it the world computer.
My first ETH cost me around $7. At the time, Ethereum was a strange experiment that most Bitcoiners laughed at. A few years later, I was farming DeFi protocols and trading NFTs on it daily. This guide explains what Ethereum actually is, how it differs from Bitcoin and what you need to know before using it.
What Is Ethereum in Simple Terms?
Bitcoin works like a calculator. It does one job, sending value, and does it very well. Ethereum, by contrast, works like a smartphone. Anyone can build an app on it, and every app shares the same network, the same money and the same users.
Underneath, Ethereum is still a blockchain, a shared ledger thousands of computers keep in sync. If that concept is new to you, start with our explainer on what blockchain is. The twist is that Ethereum’s ledger stores code as well as balances.
People often mix up three names, so here is the quick breakdown:
- Ethereum is the network itself.
- Ether, or ETH, is the coin that powers it.
- Ethereum Virtual Machine, or EVM, is the engine that runs every smart contract.
Many other chains copied the EVM. As a result, the same wallet and the same address work on dozens of networks.
Who Created Ethereum?
Ethereum began with a 19-year-old programmer named Vitalik Buterin. Born in Kolomna, Russia, he moved to Canada with his family as a child. His father introduced him to Bitcoin in 2011, and he soon started writing about it for a living.
By late 2013, Vitalik felt Bitcoin was too limited. So he published a whitepaper for a blockchain that could run any program. Several co-founders joined, including Gavin Wood, who wrote much of the early technical spec. You can read more about the man himself in our profile of Vitalik Buterin.
A crowdsale in 2014 funded development. Then, on July 30, 2015, the network went live.
How Does Ethereum Work?
Every action on Ethereum is a transaction. Sending ETH, swapping tokens, minting an NFT or claiming an airdrop all follow the same path.
- You sign the transaction with your wallet.
- Your wallet broadcasts it to the network.
- Validators check it and include it in a block.
- The EVM runs any contract code the transaction calls.
- Once enough of the network attests to the block, it becomes final.
A new block arrives every 12 seconds. Within about 15 minutes, a block reaches full finality, meaning reversing it would cost attackers a fortune in staked ETH.
Each step costs gas. Gas measures how much computing work your transaction needs, and you pay for it in ETH. A simple transfer is cheap, whereas a complex DeFi trade costs more. Fees also rise when the network gets busy. Our Ethereum gas guide covers how to time transactions and keep costs down.
What Are Smart Contracts and Tokens?
A smart contract is a program that lives on the blockchain. Once deployed, it follows its rules automatically. Nobody can quietly change the terms or stop it from paying out.
Think of a vending machine. Put in the right coins, and the snack drops out, with no cashier needed. Smart contracts do the same with money and data.
Tokens are the most common type of contract. Ethereum created shared standards for them, so every wallet and exchange knows how to handle them:
- ERC-20 covers fungible tokens like stablecoins and most airdropped coins.
- ERC-721 covers NFTs, where every token is unique.
- ERC-1155 handles both kinds in one contract, which games use a lot.
These standards are why Ethereum took off. Because everything speaks the same language, any new app can plug into tokens and protocols that already exist. Developers call this composability, or money legos.
Ethereum vs Bitcoin: The Key Differences
Both are blockchains, yet they chase very different goals. Our guide on how Bitcoin works covers the other side in depth.
- Purpose: Bitcoin aims to be hard money. Ethereum aims to be a platform for apps.
- Supply: Bitcoin caps at 21 million coins. ETH has no hard cap, but part of every fee gets burned, which offsets new issuance.
- Security: Bitcoin uses proof of work and miners. Ethereum uses proof of stake and validators.
- Speed: Bitcoin adds a block every ten minutes. Ethereum adds one every 12 seconds.
- Programmability: Bitcoin keeps its scripting deliberately limited. Ethereum can run almost any logic.
Neither is a replacement for the other. Plenty of holders own both, for different reasons.
Ethereum’s Biggest Upgrades
Ethereum keeps evolving through planned upgrades. A few changed it fundamentally.
The DAO hack in 2016 drained a major early project. To recover the funds, the community rolled back the chain. A minority refused, and their version lives on as Ethereum Classic.
London, in August 2021, introduced EIP-1559. Since then, part of every transaction fee gets burned forever.
The Merge, on September 15, 2022, switched Ethereum from mining to proof of stake. Overnight, its energy use dropped by more than 99%.
Shapella, in April 2023, let stakers withdraw their ETH for the first time.
Dencun, in March 2024, added cheap data space for layer 2 networks. Fees on rollups like Arbitrum and Base fell sharply afterwards.
Meanwhile, the roadmap continues. Future upgrades target more scaling and simpler validator setups.
Layer 2s: Where Most Ethereum Activity Happens Now
Ethereum’s main chain can only handle so many transactions. Rather than sacrificing security, it pushes most everyday activity onto layer 2 networks.
Layer 2s, also called rollups, process transactions off the main chain. They then post compressed proof back to Ethereum, inheriting its security. In practice, a swap that costs dollars on mainnet costs cents on a rollup.
Arbitrum, Base and Optimism are the best known. Your ETH address works on all of them. However, your coins do not move between them automatically. You need a bridge for that, and our explainer on how crypto bridges work covers the risks first.
What Can You Do With Ethereum?
Plenty. Here is what most people use it for:
- DeFi: lend, borrow, swap and earn yield without a bank.
- Stablecoins: hold and send dollars onchain, settled in minutes.
- NFTs: own digital art, collectibles and in-game items.
- Staking: lock ETH to help secure the network and earn rewards.
- Airdrops: use new protocols early and qualify for free tokens.
That last point is personal for me. Ethereum and its rollups hosted most of the biggest airdrops in history. I also held collections like CryptoPunks and Pudgy Penguins during the NFT cycle, and that alone made me eligible for a stack of airdrops. Our airdrop farming guide shows how to put an Ethereum wallet to work the same way.
Meme coins live here too, although Solana took most of that action lately. For the Ethereum side, see our list of the best Ethereum meme coins.
The Risks to Know
Ethereum is mature, yet using it still carries real risk.
Smart contracts can have bugs. Even audited protocols get exploited now and then, so spread your funds across platforms.
Approvals linger. When you approve a token for a dApp, that permission stays active until you revoke it. Old approvals are a favorite target for drainers.
Phishing never stops. Fake airdrop sites and lookalike dApps try to trick you into signing malicious transactions. Read what you sign, every single time.
Fees can spike. During hype events, mainnet gas jumps fast. When that happens, rollups usually offer a cheaper way to do the same thing.
Price swings hit hard too. ETH has fallen more than 70% in past bear markets. Treat it like any volatile asset.
How to Get Started With Ethereum
Getting your first ETH takes three steps.
First, buy some on an exchange. Our first-time Ethereum buying guide walks you through every screen.
Next, set up a wallet you control. MetaMask is the classic choice, and our MetaMask review covers setup and safety settings.
Finally, send a small test amount before moving the rest. Our walkthrough on how to send ETH shows each step, including picking the right network.
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Final Words
Ethereum turned blockchains from ledgers into platforms. Smart contracts made DeFi, NFTs, stablecoins and modern airdrops possible, and layer 2s now carry most of the daily traffic. ETH fuels all of it, as gas, as collateral and as a staking asset.
For beginners, the path is straightforward. Learn how gas works, get a wallet you control and never sign something you do not understand. From there, Ethereum is the doorway to almost everything else in crypto, including how crypto airdrops work from the very first claim.
FAQ
Is Ethereum the same as ETH?
Not quite. Ethereum is the network. ETH, or ether, is the coin you use to pay fees and stake on that network. In everyday talk, though, most people use the names interchangeably.
Who owns Ethereum?
Nobody owns Ethereum. Thousands of independent validators run it. The Ethereum Foundation funds research and development, yet it cannot control the network or move anyone’s funds.
Does ETH have a maximum supply?
No. ETH has no hard cap. However, EIP-1559 burns part of every fee, so supply grows slowly and can even shrink during busy periods.
Can I stake ETH?
Yes. Running your own validator requires 32 ETH. With less, you can stake through a staking pool or exchange, which takes a cut of the rewards.
Is Ethereum better than Bitcoin?
They do different jobs. Bitcoin focuses on being scarce, secure money. Ethereum focuses on running apps and smart contracts. Many investors hold both.
What is an ERC-20 token?
An ERC-20 token is any token built on Ethereum’s common standard for fungible coins. Stablecoins like USDC and most airdropped tokens follow it. Thanks to that standard, any Ethereum wallet can hold them.
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