If we talk about Bitcoin,it's the same as we talk about the pioneer of Cryptocurrency. Many people who know cryptocurrency are just know bitcoin even though there are thousands of tokens and other coins. Like branding items, the most famous will most remember and also most used. BTC is also like the parent of other coins, if BTC price is quite volatility, other coins also have almost similar movements, many traders hoping Altcoin can stand alone and not follow BTC price but in fact it cannot. That why BTC still number one and most favorite coins for payment.