Altcoin is a term used to describe alternative cryptocurrencies that are not Bitcoin. The term "altcoin" is short for "alternative coin" and refers to any cryptocurrency other than Bitcoin.$ALT

Here are some key points about altcoins:

Key Features:

1. _Diversification_: Altcoins offer diversification benefits, allowing investors to spread risk across multiple assets.

2. _Innovation_: Altcoins often introduce new features, technologies, and use cases that differentiate them from Bitcoin.

3. _Lower Market Capitalization_: Altcoins typically have lower market capitalization compared to Bitcoin.

Examples of popular altcoins include:

1. Ethereum (ETH)

2. Litecoin (LTC)

3. Bitcoin Cash (BCH)

4. Cardano (ADA)

5. Stellar (XLM)

6. EOS

7. Binance Coin (BNB)

8. Tether (USDT)

Use Cases:

1. _Payments_: Altcoins can be used for payments, similar to Bitcoin.

2. _Smart Contracts_: Altcoins like Ethereum enable smart contract functionality.

3. _Gaming and NFTs_: Altcoins are used in gaming and NFT (non-fungible token) applications.

4. _DeFi Applications_: Altcoins are used in various DeFi (decentralized finance) applications.

Please note that the information available about altcoins might be subject to change, and their development and adoption are still in progress. Always do your own research and stay up-to-date with the project's developments before making any decisions.