#AltcoinSeasonLoading Altcoins, or "alternative currencies", refer to all cryptocurrencies other than Bitcoin. Among the most well-known are Ethereum, Solana, Cardano, and BNB. Each altcoin aims to improve or complement the functionalities of Bitcoin, whether in terms of speed, transaction cost, or utility. Some serve as platforms for smart contracts, while others act as means of exchange in specific ecosystems. By 2025, altcoins are gaining popularity due to the increasing adoption of blockchain technology. They offer investors diversification opportunities with strong growth potential, although they are more volatile than Bitcoin.