Popular altcoins to know

Cryptpcurrencies, Bitcoin and are altcoins – what’s the difference? 
What are the different types of altoins?
Ethereum (ETH) and Tether (USDT) – the two most popular altcoins.Do you know there are thousands of alternative coins, or altcoins? In the ten years since Bitcoin’s genesis block was created, thousands of alternative cryptocurrencies, or altcoins, have emerged as a result of blockchain innovation.
Altcoins are any coins or tokens that isn’t Bitcoin. Al