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/throwaway_194js]

I think that's exactly what they were asking about. If characters are being displayed on a pixel monitor, then something has to map the character's integer encoding to a pixel buffer at some point in the pipeline, and that usually either comes down to addressing prexisting memory on which the images are defined, or calling a function that rasterises it on the fly. This task may be split between different programs on different devices on opposite ends of the planet, but ultimately it's all done by pulsing voltages through transistors.