Major Altcoins

• Ethereum (ETH): Smart contracts.

• Ripple (XRP): Fast international payments.

Litecoin (LTC): Faster, cheaper Bitcoin.

• Cardano (ADA): Secure, scalable blockchain.

Polkadot (DOT): Blockchain interoperability.

Stablecoins

• Tether (USDT): Pegged to USD.

• USD Coin (USDC): Another USD-pegged coin.

• Dai (DAI): Decentralized USD-pegged coin.

Utility Tokens

• Chainlink (LINK): Connects smart contracts to real-world data.

• Uniswap (UNI): Token for Uniswap exchange.

Binance Coin (BNB): Used on Binance exchange.

Privacy Coins

• Monero (XMR): Focuses on privacy.

Zcash (ZEC): Optional private transactions.

Meme Coins

Dogecoin (DOGE): Started as a joke, strong community.

• Shiba Inu (SHIB): Inspired by Dogecoin.

Emerging and Specialized

Solana (SOL): High speed, low cost.

Avalanche (AVAX): High performance.

Algorand (ALGO): Efficient, fast.

DeFi Tokens

• Aave (AAVE): Decentralized lending.

• Compound (COMP): Lending and borrowing.

SushiSwap (SUSHI): Decentralized exchange.

NFT and Gaming Tokens

Axie Infinity (AXS): Game token.

Decentraland (MANA): Virtual world.

• The Sandbox (SAND): Virtual world.

Interoperability and Infrastructure

• Cosmos (ATOM): Internet of Blockchains.

VeChain (VET): Supply chain.

This provides a brief overview of various types of altcoins and their main purposes.