Plain English
Altcoin is shorthand for “alternative coin” — originally meaning anything other than Bitcoin. Today it usually means anything outside the top tier (Bitcoin, sometimes Ethereum). Some traders also separate “altcoins” from “memecoins” by intent: altcoins claim utility, memecoins are explicitly cultural plays.
How it actually works
The altcoin universe has thousands of assets across hundreds of chains. They cluster into categories: L1s (Solana, Avalanche), L2s (Arbitrum, Base), DeFi tokens (UNI, AAVE), infrastructure (LINK, GRT), gaming, AI, RWA, memes. Liquidity drops off quickly outside the top 100 by market cap.
What it means for you
“Altcoin season” — periods when alts outperform BTC — has historically followed a roughly cyclical pattern, but timing it is brutal. For most portfolios the sane allocation is barbell: a heavy core in BTC/ETH and a small, fully-risk-aware sleeve in selected alts with a clear thesis. Avoid the dollar-weighted trap of buying 50 alts with no plan.
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Educational content only. Not investment, tax, or legal advice.