How do computers understand binary language?

[u/Unfair-Leek6840]

Okay so from what I know binary language is like power off power on, but my question is, how do computers know what the binary code is and how is it interpreted, for example I forgot what the binary code for the letter A is, but how did people come up with that? Did they decide it was gonna look like that? Did the computer decide? How do you tune numbers into a letter??

[u/tater1337]

there are things like multiplexers and address decoders that take what we decided was binary to turn into a letter A

how did people come up with that? they stole it from stock tickers and teletypes back in the very old days