“Altcoins” are cryptocurrencies that exist in addition to Bitcoin. They have certain qualities in common with Bitcoin, but they are also distinct from it in other respects.
Like :
1. They share similar methods to either Bitcoin or other popular currencies like Ethereum or Cardano’s ADA. Altcoins also aspire to become bigger than bitcoin by becoming a more affordable way for digital transactions.
2. Altcoins are designed to overcome Bitcoin’s perceived restrictions in order to gain a competitive edge. Many cryptocurrencies, including Bitcoin and Ethereum, employ the Proof-of-Stake.
3. Altcoins have built a market for themselves by establishing a clear distinction between themselves and the Bitcoin currency.
In short, Any alternate crypto to Bitcoin is called an altcoin. Cryptocurrencies known as altcoins make use of a technology known as “blockchain,” which enables the transmission of secure peer-to-peer transactions. Building on the popularity of Bitcoin, they tweak the regulations a little to appeal to a wider range of customers.
Few alt coins that are good to keep watch:
Aave, Compound, Ripple and ADA are examples of altcoins.