Altcoin
Any cryptocurrency other than Bitcoin.
In-Depth Explanation
The term originated as 'alternative coin'. While originally referring to simple Bitcoin forks like Litecoin, today it encompasses all Layer 1 platforms, Layer 2s, DeFi governance tokens, and utility coins.
Practical Market Example
Real-World Application
Ethereum, Solana, and Cardano are leading Layer 1 altcoins.