Based on what I have learned , Bitcoin and altcoin  are both cryptocurrency wherein many people tends to use these two coin. Bitcoin and altcoin are the same in appearance, both are digital cryptocurrency. The difference between the two is that bitcoin is the king of all cryptocurrency while the altcoin follow the BTC and oTher coin like ethereum and such. BTC is the first coin that has been created or can be called as the pioneer coin. Actually, BTC is the center of all coin and other coin is connected to the BTC. And we all know that BTC are the most valuable than rest of all coin.