You have to know what Bitcoin is and why altcoin is currently appearing. For digital transactions, bitcoin is currently slower but because the value or price of bitcoin is very good, many people want BTC even though Bitcoin doesn't have a physical form, then because of Bitcoin Transactions began to slow down, at that time altcoin emerged with the first smartcontract technology, ethereum, you can have altcoins at affordable prices and with newer technology, so many people choose Bitcoin or altcoin that have faster technology for transactions