Ethereum, Explained: The Platform Behind Most of Crypto
What Ethereum actually does that Bitcoin doesn't, why 'a world computer' is closer to the mark than 'digital cash', and the risks that are unique to holding Ether.
By Firoz Khan|2 September 2026|Updated 20 September 2026|9 min read
Bitcoin was designed to do one thing extremely well: move scarce digital money without a bank. Ethereum was designed to do far more than one thing, at the cost of being harder to explain in a single sentence. It's a platform other applications run on, and Ether, its native asset, is closer to the fuel that powers them than to digital cash in its own right.
Programmable money, not just digital money
Ethereum introduced smart contracts, self-executing code that runs exactly as written once deployed, with no need for a third party to enforce the terms. That's the feature Bitcoin deliberately doesn't have. It's what turns a blockchain from a payments ledger into a platform capable of running entire applications, lending markets, exchanges, games, on top of it.
What actually runs on it
Most of DeFi, a large share of NFTs, and a huge number of tokens are built on Ethereum. ETH itself is used to pay the gas fee for every transaction and every smart contract interaction on the network, which means demand for it is tied to how much activity is actually happening on the platform, not purely to speculation about its price.
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The Merge and proof of stake
In September 2022 Ethereum switched its entire consensus mechanism from proof of work, the energy-intensive mining model Bitcoin still uses, to proof of stake, where validators lock up ETH as collateral instead of running mining hardware. The network's own figures put the resulting energy reduction at over 99%. Validators earn staking rewards for securing the network, which is now the primary way new ETH enters circulation.
Gas fees are Ethereum's biggest UX problem
Popularity is Ethereum's own worst enemy on cost: when demand for block space spikes, gas fees spike with it, sometimes making small transactions uneconomical. Layer-2 networks, built on top of Ethereum specifically to process transactions more cheaply before settling back to the main chain, exist largely to solve this, and have meaningfully reduced typical costs for anyone using them instead of transacting directly on the base layer.
Risk profile versus Bitcoin
Ether tends to move with Bitcoin in broad market cycles but is generally more volatile in both directions. It carries a risk category Bitcoin largely avoids: smart contract exploits and bugs in the applications built on top of the network, which have caused genuine losses even when the underlying Ethereum protocol itself worked exactly as intended.
A reminder
The FCA risk warning still applies to higher-risk crypto content. Always assess how much risk you are willing to take before buying.
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