I am not clear about altcoin system. I actually want to know about altcoin. I am new in digital currency market. So I want to know more about digital currency.
As many users already said altcoin means alternative coins. As well we know Bitcoin is a mother coin. Except bitcoin all others coins is altcoin. Buy all are digital currency. Altcoin doesn't mean its useless. There is few potential altcoin like ETH, LTC and so on. Usually altcoin trade against btc, usd, eth. Since most of CEX exchange consider bitcoin as primary trading pair that's why Bitcoin called mother coin and all other coin is altcoin.