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Bitcoin vs Altcoins

In short

Bitcoin was first; 'altcoins' are every other crypto.

Bitcoin, launched in 2009, was the first cryptocurrency and remains the largest by market value. 'Altcoin' is short for 'alternative coin' and covers every cryptocurrency that came after — from Ethereum, which added programmable smart contracts, to thousands of smaller tokens with widely varying purposes, adoption levels, and track records.

Altcoins differ from Bitcoin in design goals and technical trade-offs, not just branding. Some, like Ethereum, extend the blockchain concept to run smart contracts — self-executing code that powers applications beyond simple payments, such as decentralized exchanges and lending markets. Others are optimized for transaction speed, lower fees, privacy, or a narrow use case. Because launching a new token is technically straightforward, the altcoin universe spans everything from established, actively-developed networks with years of operating history to speculative projects with little real adoption. Market capitalization, developer activity, and length of track record are among the factors used to gauge how established a given altcoin is relative to Bitcoin.

Related concepts

  • What is Cryptocurrency? — Cryptocurrency is digital money that exists as entries on a shared, tamper-resistant ledger called a blockchain, rather than in a bank's private database. With Bitcoin, the first cryptocurrency, no bank checks that you have the funds — a network of independent computers around the world verifies and records every transaction instead.
  • Bitcoin Dominance — Bitcoin dominance shows how much of all crypto money is in Bitcoin. High dominance (>60%) means investors prefer Bitcoin's safety. Falling dominance during a bull market often signals altcoin season — smaller coins outperforming Bitcoin.
  • Understanding Market Cap — Market cap answers 'how big is this asset, in total?' A cryptocurrency trading at $10 with 1 million coins in circulation has the same $10 million market cap as one trading at $1,000 with 10,000 coins — price alone says nothing about size, which is why market cap, not price, is used to rank and compare cryptocurrencies.