Altcoins are all cryptocurrencies other than Bitcoin.
They are alternative options that may offer different features or improvements over Bitcoin. For example, Ethereum is known for its smart contracts, which allow for the creation of decentralized applications. Litecoin is often called the “silver” of Bitcoin because it offers faster transactions. There are also newer altcoins that aim to solve specific problems or use new technologies.
Each altcoin has its own features and goals, and it is important to carefully study how they work before investing.