1 sat (Satoshi) is 1/100000000 bitcoin, so at the moment it's around 0,001 euro. And then you get millisatoshis that can be used on the lightning network, but

1 sat (Satoshi) is 1/100000000 bitcoin, so at the moment it's around 0,001 euro. And then you get millisatoshis that can be used on the lightning network, but I've not dealt with that directly myself.