What is Ethereum?
Author: Domeny.ForSale editorial team Published
In brief: Ethereum is a public blockchain network that lets users transfer digital assets and run programs called smart contracts. Its native cryptocurrency, ether (ETH), is used, among other things, to pay for operations and secure the network. Ethereum is therefore not just a “digital coin”, but also a platform for applications that operate without a single central operator.
Ethereum and ETH — what is the difference?
Ethereum is the network and the set of rules governing how it operates. Ether (ETH), meanwhile, is an asset used within that network. When someone says they are “buying Ethereum”, they usually mean buying ETH, not shares in a company. Holding ether does not confer shareholder rights or a share in a business’s profits.
Ethereum is based on a blockchain: a ledger of operations grouped into blocks, with copies stored on many computers. Network participants can independently check that the records comply with its rules. Transaction data is public, although a wallet address does not itself contain its owner’s first and last name.
Bitcoin was created primarily as a system for transferring digital money. From the outset, Ethereum has placed greater emphasis on programmable operations and applications. This is a comparison of their main underlying aims, not a claim that Bitcoin is only used for payments or that Ethereum cannot be used for them.
How does the network work, and who validates transactions?
Ethereum uses proof of stake, a mechanism for reaching agreement on the state of the network based on ETH pledged as collateral. Validators — participants running the appropriate software — propose blocks and confirm their validity. They may receive rewards for carrying out their duties and lose some of their collateral for certain breaches of the rules. Ethereum no longer uses proof-of-work mining.
A user sends a transaction through a wallet and signs it with a private key, a secret piece of information that allows operations to be authorised. The network checks the signature and other conditions, such as the available funds. A recorded and finalised transaction has no standard “undo” function of the kind found in some payment services.
A wallet is a tool for managing keys and communicating with the blockchain. It does not store coins like files on a disk: balances are determined by the network’s records. Losing your keys may mean losing access, while revealing them may give someone else control over your assets.
Smart contracts: programs that execute predefined rules
A smart contract is a program stored on a blockchain that executes specific instructions when called. For example, it can check the conditions for exchanging two tokens and settle the exchange in a single operation. The name does not mean that the program is “intelligent” or that it automatically constitutes a contract in the legal sense.
Imagine a ticket vending machine: once its conditions are met, it performs a programmed action. A smart contract works similarly, but its rules are executed by the network. If the code contains an error, automatic execution does not protect the user from loss.
Projects built on Ethereum include:
- DeFi financial applications: services that use smart contracts for asset exchanges, loans or other financial operations.
- Tokens: digital units created by applications. These include stablecoins, which are designed to maintain their value relative to a specified reference point, such as the dollar.
- NFTs: unique tokens that can represent identifiers for items, tickets or collectible assets. Buying an NFT does not automatically mean acquiring copyright.
Not every application running on Ethereum is fully decentralised. Its interface may depend on a single company, and an administrator may have permission to change the contract. Programs that need data from outside the blockchain use additional mechanisms called oracles, which also introduce dependencies and risks.
Gas and layer-2 networks — where do fees come from?
Gas is a unit that measures the work needed to execute an operation on Ethereum. Transaction fees on the main network are paid in ETH. They depend, among other things, on the complexity of the operation and current demand for block space, not solely on the value of the funds being transferred.
A simple ETH transfer usually requires less work than a multi-step operation in a financial application. A transaction that fails during execution may also incur a fee, because the network has performed some of the calculations. Before confirming an operation, check the estimated fee in your wallet.
Layer-2 (L2) networks process operations outside Ethereum’s main network, using it for settlement and security in ways that depend on the particular solution. They often allow lower costs, but have their own rules and additional risks. Moving assets between networks may require a bridge, a transfer mechanism, or a withdrawal from an exchange directly to the chosen network.
How can you explore Ethereum without unnecessary risk?
You do not need to buy ETH to understand Ethereum. You can first view transactions in a public explorer, a search tool for blockchain data, or try a wallet on a test network. Test funds are not ordinary ETH from the main network.
If you plan to make your first transfer, check the network supported by the recipient, the address, the fee and the minimum deposit amount, if the service requires one. Then consider making a small test transfer. The same address format on two networks does not guarantee that an exchange will credit deposits from both.
Never give your wallet’s recovery phrase to a website or a support representative. When using applications, also read the permissions: approving token spending may allow a contract to take those tokens later without you signing each transfer separately.
ETH is subject to price fluctuations, and staking, applications and custodial services each carry distinct risks. This overview explains the technology; it is not a personalised investment recommendation. Before using a particular service, confirm its current fees, supported networks and withdrawal rules in its official documentation.
See also: What is 2FA?
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