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As the name says it and to keep it simple, they are all the other cryptocurrencies that aren't Bitcoin.

Altcoins are an alternative digital currencies
to Bitcoin

I simply love to refer to altcoins as coins one can invest one at a cheaper price compared to Bitcoin

Anything that is a crypto coin but not a Bitcoin is an Altcoin.

As the name "alt" implies. , an alternative coins for investment in the crypto space

Coins that offer alternative options for investing on the crypto market

Coins that can make you a lot of money. 🤣