Please can someone tell me what altcoins is and how to
know Altcoins
OP, you should move this topic to altcoins board.
Altcoins are known to be an alternative cryptocurrency to bitcoin, altcoins are duplicate of bitcoin and they all depend on bitcoin price movement in their pump and dump. We are numerous altcoins out there in the market and it is not advisable to invest in them, because their devs use them to extort money from the people after a hype. Here are some altcoins Etherum, Litecoin, Dodgecoin and many more.