Back with a video from 3Blue1Brown (from 2020).

Dive into the wondrous world of error-correcting codes.

In case this video on the Hamming code triggers your interest (it should, it is quite amazing when you realize that only 8 error-correcting bits are required to find an error in a 256 bit system) you can continue with the Luhn algorithm to understand how systems detect if you made a typo when writing your credit card number. That algorithm is more limited though in the sense that it only detects if an error was made, while the Hamming approach finds if an error was made and where the error is located.