What is Altcoin?
Crypto Glossary Definition
Shorthand for any cryptocurrency that isn't Bitcoin. For an overview of many different altcoins, view our Altcoin Explainer.
Why Altcoin Matters
Altcoin is shorthand for "any coin that isn't Bitcoin," from major projects like Ethereum and Solana down to obscure micro-cap tokens. The term doesn't imply quality either way — it's purely a category label, and altcoins as a group tend to be more volatile than Bitcoin.
Altcoin in Practice
A newcomer researching crypto for the first time buys a small amount of Bitcoin, then browses an exchange's listings page and finds thousands of other tokens ranging from Ethereum and Solana down to tiny projects with almost no trading volume. Confused by the terminology, they ask in an online forum why people keep calling all of these other assets altcoins, and a more experienced trader explains that the label simply means any cryptocurrency that isn't Bitcoin, regardless of size, purpose, or credibility. The newcomer buys a small position in a mid-cap altcoin focused on decentralized cloud storage and, separately, in a low-cap token they saw trending on social media with no clear product at all. Over the following months they watch the two perform very differently: the established altcoin moves roughly in line with the broader market, while the speculative micro-cap swings wildly on thin volume, doubling one week and losing most of its value the next. The experience teaches them that altcoin is purely a category label rather than a quality judgment, since it lumps genuinely useful blockchain projects together with pure speculation, and that altcoins as a group tend to carry significantly more volatility than Bitcoin itself, especially the smaller and less liquid ones.
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