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.
In the same respect, while BTC is tightly linked to how the Altcoins behave, as history showed in the event of large BTC drops some of the Altcoins are likely to follow. This is because the BTC in a way determines the strength of the crypto coins markets and is an indicator of people's confidence in the industry.
That is to say that maybe not all altcoins will drop if BTC drops, but the ones with a high market cap will likely follow BTC's trend, whilst other smaller coins might still keep on pumping, often as an act of artificial pump.[/list][/list]