Ethereum Explained
Ethereum (ETH) is the world's second-largest cryptocurrency by market capitalization — and arguably the most important blockchain platform in existence.
While Bitcoin was designed primarily as digital money and a store of value, Ethereum was built to be something far more ambitious: a programmable blockchain — a global, decentralized computer on which anyone can build applications.
Who Created Ethereum?
Ethereum was proposed in 2013 by Vitalik Buterin, a Canadian-Russian programmer who recognized that Bitcoin's blockchain had limited programmability.
Buterin envisioned a blockchain that could execute any kind of agreement or application — not just financial transfers. The Ethereum network officially launched in July 2015.
Ethereum vs. Bitcoin: Key Differences
| Feature | Bitcoin | Ethereum |
|---|---|---|
| Primary Purpose | Digital money / Store of value | Programmable blockchain platform |
| Smart Contracts | Limited | Full support |
| Supply Cap | 21 million BTC | No hard cap |
| Consensus | Proof of Work | Proof of Stake |
| Use Cases | Payments, savings | DeFi, NFTs, DAOs, Web3 |
What Are Smart Contracts?
The most important feature of Ethereum is smart contracts — self-executing programs stored on the blockchain that automatically carry out agreements when predetermined conditions are met.
Think of a smart contract like a vending machine:
- You insert the correct amount
- The machine automatically delivers your item
- No cashier, no middleman, no trust required
Smart contracts make it possible to build:
- Decentralized exchanges (DEXs)
- Lending and borrowing protocols
- NFT marketplaces
- Decentralized autonomous organizations (DAOs)
- Gaming and metaverse applications
Ether (ETH): The Fuel of Ethereum
Ether (ETH) is the native cryptocurrency of the Ethereum network. It serves two primary purposes:
- Gas fees — ETH is used to pay for transaction processing and smart contract execution
- Store of value — ETH is widely held as an investment asset
What Are Gas Fees?
Every operation on Ethereum requires computational work. Users pay gas fees in ETH to compensate validators for processing their transactions.
Ethereum's Transition to Proof of Stake
In September 2022, Ethereum completed The Merge — transitioning from Proof of Work (energy-intensive mining) to Proof of Stake (validators stake ETH as collateral).
This reduced Ethereum's energy consumption by approximately 99.95% and introduced a new validator model where ETH holders can earn rewards by staking their tokens.
What Is Built on Ethereum?
Decentralized Finance (DeFi)
Protocols like Uniswap, Aave, and Compound allow users to trade, lend, borrow, and earn yield without banks.
NFTs
Most NFT marketplaces and collections are built on Ethereum.
DAOs
Governance systems where token holders vote on protocol decisions.
Stablecoins
USDC, DAI, and other stablecoins are primarily issued on the Ethereum network.
Layer 2 Networks
Because Ethereum can become congested and expensive during high demand, Layer 2 solutions — including Arbitrum, Optimism, and Base — process transactions off the main chain and settle them back periodically, dramatically reducing fees.