Generally, the price of Bitcoin is able to affect the price of Altcoin. However, this relationship is not always predictable. Bitcoin is the main currency, though Fiat currency, Tether, and Ethereum are also frequently used. When the Bitcoin price was dropped, the Altcoin price slowly also dropped.

However, when the price of Bitcoin rises rapidly, Altcoin may have an impact:

Altcoins will be depressed because money flows into the Bitcoin market.

But Altcoins can also go up.