Altcoin is the alternative coin and it also called as cryptocurrency (other than Bitcoin). All most popular altcoin or cryptocurrency used the same fundamentals of building blocks asn Bitcoin does. Different companies use the same technology which Btcoin use in some ways to achieve different goals.
A lot of movement has happened on the crypto ranking charts since the volatility has returned to crypto markets. First, it was Ethereum that was dethroned by XRP for second place, then Bitcoin (SV) moved above Tether to eighth place for sometime before settling back to ninth. And now it’s Stellar that has pushed Bitcoin