Altcoin
Any cryptocurrency other than Bitcoin. The term combines 'alternative' and 'coin' to describe all other digital currencies that emerged after Bitcoin. Altcoins range from major platforms like Ethereum to small experimental tokens.
“Ethereum, Cardano, and Solana are all considered altcoins despite being major cryptocurrencies with billions in market capitalization.”
Bitcoin (BTC)
The first and largest cryptocurrency by market capitalization, created in 2009 by the pseudonymous Satoshi Nakamoto. Bitcoin is designed as a decentralized digital currency with a hard-capped supply of 21 million coins, enforced through a halving mechanism that reduces new coin issuance approximately every four years. It uses Proof of Work consensus and is often referred to as 'digital gold.'
Ethereum (ETH)
The second-largest cryptocurrency and the most widely used smart contract platform, created by Vitalik Buterin and launched in 2015. Ethereum introduced programmable blockchain functionality, enabling the creation of tokens, DeFi protocols, NFTs, and dApps. In September 2022, Ethereum transitioned from Proof of Work to Proof of Stake ('The Merge'), reducing energy consumption by over 99%.
Token
A digital asset created on an existing blockchain rather than its own native chain. Tokens can represent a wide range of assets and utilities — from currency and governance rights to real-world assets and collectibles. Unlike coins (BTC, ETH) which are native to their blockchain, tokens are created using smart contracts on platforms like Ethereum (ERC-20, ERC-721).