Definition
An altcoin, short for alternative coin, generally means a cryptocurrency other than Bitcoin. The category can include native coins, application tokens, stablecoins and meme coins. Some market participants discuss ether separately, so it is useful to check how a source defines the label. Altcoin is a broad market term, not a technical standard or a quality rating.
How It Works
Altcoins do not share a single mechanism. A coin may secure its own blockchain, while a token can run on an existing network through smart contracts. Projects can differ in consensus rules, issuance schedules, governance and the rights attached to the asset. Sharing the altcoin label therefore does not mean two assets have similar purposes or risk profiles.
Uses and Limitations
The term helps distinguish Bitcoin from the wider crypto market. Evaluating an individual asset requires examining its actual function, supply distribution, liquidity and security assumptions. A lower unit price does not make it cheaper in valuation terms, and a small market capitalization does not guarantee growth. Concentrated ownership or shallow liquidity can make prices easier to move.