Back in the past, way before we had computers, our reality was analog: we thought of it as continuous, and thought that we could never know our reality fully, because all we were doing in science was an approximation of a reality we could never completely know. Pi for instance is usually seen as 3.1415926 approximately, but in reality it is a number that has no repeating digits, and is truly endless.
The digital age changed a lot, but only got us closer in terms of precision at first. Nowadays we have computed Pi to very many digits, and we use that knowledge to keep our communications safe.