The term 'Altcoin' is derived from 'alternative coin', which highlights their role as alternatives to Bitcoin, the first and most established cryptocurrency. Altcoins can serve various purposes, from providing enhanced functionalities, like smart contract capabilities in Ethereum, to enabling privacy features as seen in Monero and Zcash. Altcoins may vary in their consensus mechanisms, use cases, and underlying technologies, allowing for innovation in the cryptocurrency space. Unlike Bitcoin's capped supply, many altcoins offer unique monetary policies and incentives, leading to a diversified ecosystem.