Altcoins are other cryptocurrencies besides Bitcoin. They are all different, but they all use blockchain technology. Blockchain is a special way to keep track of information so that it can't be changed or hacked.
Altcoins are still new, but they have the potential to change the way we use money. For example, some altcoins are designed to be faster and cheaper than Bitcoin. Others are focused on specific applications, such as gaming or social media.
Here are some of the most popular altcoins:
Ethereum (ETH)
Solana (SOL)
Cardano (ADA)
Binance Coin (BNB)
XRP