What Is Ethereum?

What Is Ethereum?

Ethereum is a blockchain built to run programs, not just record payments. Its native coin is Ether (ETH). The difference from Bitcoin is purpose: Bitcoin is digital money, while Ethereum is a programmable platform that other tokens, apps and decentralised finance are built on. It is the second-largest crypto asset and the largest altcoin, which is why traders treat it as the bellwether for the rest of the market beyond Bitcoin. If Bitcoin proved you could have decentralised money, Ethereum’s ambition was bigger: to be a decentralised platform on which almost anything could be built.

How Is Ethereum Different From Bitcoin?

• Purpose: Bitcoin stores value; Ethereum runs smart contracts.
• Supply: Bitcoin is capped at 21 million; Ether has no fixed cap, though issuance is low and can fall.
• Consensus: Ethereum uses proof of stake (validators), not Bitcoin-style mining.
• Role: Ethereum is the base layer for much of crypto, so its health affects far more than its own price.

The simplest way to hold the distinction: Bitcoin is best understood as an asset, a scarce, digital store of value, while Ethereum is best understood as a platform, an engine that other assets and applications run on. They are not really competitors so much as two different kinds of thing. One notable consequence of the supply difference is that Ether’s monetary policy is more flexible than Bitcoin’s fixed cap: under proof of stake, and with a mechanism that "burns" some Ether on every transaction, the net supply can even shrink during busy periods, a very different design philosophy from Bitcoin’s hard, unchangeable 21-million limit.

What Ethereum Makes Possible

Ethereum’s great innovation was making the blockchain programmable through smart contracts, self-executing code that runs on the network, and that single idea opened the door to almost everything in modern crypto. The vast majority of tokens are smart contracts on Ethereum; decentralised finance (DeFi), letting people lend, borrow and trade without banks, was largely born there; NFTs, stablecoins and member-run DAOs all run on it. This is why Ethereum is sometimes called a "world computer": it is a shared, global platform on which developers can build decentralised applications, with Ether (ETH) serving as the "gas" that pays for the computation. Crucially, this central role means Ethereum’s health matters far beyond its own price, because so much of the crypto economy is built on top of it, the fortunes of countless tokens and applications are tied to the platform beneath them, which is part of why ETH is watched so closely as a barometer of the broader ecosystem.

Why Does Ethereum Shadow Bitcoin So Closely?

Because Bitcoin sets the mood for crypto, the majors tend to follow it, and Ethereum follows most tightly of all. CFGI data shows Ethereum matching Bitcoin sentiment 78% of the time, the tightest of any major coin. That is market structure, not coincidence: the largest, most liquid assets reprice the same fear and greed together, as money flows into and out of crypto as a whole. The useful moments, then, are when they diverge. When Ethereum sentiment pulls away from Bitcoin, it signals that something specific to Ethereum, a major network upgrade, a surge in DeFi activity, a shift in the ETH-versus-BTC narrative, is driving its crowd independently of the market leader. Watching that gap, rather than just Ethereum’s level, can be revealing, since a widening divergence is often the first sign that the market has begun to price Ethereum on its own merits rather than simply as a leveraged echo of Bitcoin. You can compare them on the Ethereum Fear and Greed Index and the wider crypto market.