Bitcoin vs. Ethereum: The Key Differences Explained

They're the two names everyone mentions first in crypto — but Bitcoin and Ethereum were built to do very different things. Here's what actually separates them, in plain language.

Bitcoin: digital money, and nothing else

Bitcoin was created in 2009 with one clear purpose: to be a form of money that no single government, company, or bank controls. It has a fixed supply cap of 21 million coins, which is central to its "digital gold" reputation — scarcity by design. Bitcoin's software is intentionally simple and changes very slowly, prioritizing security and stability over new features.

Ethereum: a platform, not just a currency

Ethereum launched in 2015 with a broader goal: not just to move value, but to run programs — called "smart contracts" — directly on the blockchain. This is what makes DeFi (decentralized finance), NFTs, and thousands of other applications possible. Ethereum's own currency, Ether (ETH), is used to pay for computing power on the network, not primarily as a standalone currency like Bitcoin.

Side-by-side comparison

• Main purpose: Bitcoin = store of value / digital money. Ethereum = programmable platform for applications.
• Supply: Bitcoin is capped at 21 million. Ethereum has no hard cap, though its supply growth has slowed significantly since a 2022 upgrade.
• Speed of change: Bitcoin evolves conservatively and slowly. Ethereum updates more frequently to add capabilities.
• What you can build on it: Bitcoin supports limited scripting. Ethereum supports full smart contracts — the foundation of DeFi and NFTs.

Which one is "better"?

Neither — they're not really competitors in the traditional sense, since they solve different problems. Many long-term holders own both: Bitcoin for its simplicity and scarcity narrative, Ethereum for exposure to the broader ecosystem of applications built on top of it.

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Keep reading

Curious what powers Ethereum's applications? Read What Is DeFi? for a plain-language explanation of decentralized finance.