American Standard for Information Interchange (ASCII) is a method of encoding characters that is based on the order of alphabetic characters in the English language.
ASCII integer representations have printable and non-printable subsets. Printable characters are normal characters, and non-printable characters are characters used to represent keyboard keys, e.g., backspace, delete, and return.
Source: https://www.techopedia.com/definition/24322/american-standard-for-information-interchange-ascii