Yes, I understand. I think the source of this money comes from the device Satoshi Nakamoto?
No, there is no "device Satoshi Nakamoto". The coins are created on a protocol level as a reward for the miners securing the chain.
These "bitcoins" are really just mathematical tokens which are very carefully controlled by the network protocol to prevent counterfeiting, theft, etc.
You can find more on
StackExchange.
as far as i know he never explained why
There doesn't need to be an explanation for something that may very well be an arbitrary number as long as the limit remains fixated.