ASCII Armor is a term used to describe an encoding process, in which data in a binary format is transformed into a textual format, to allow the data to be successfully transmitted through channels designed only for text messages, such as e-mail or usenet.
ASCII Armor is a term used to describe a type of encoding process, in which data that is in a binary format (not human-readable) is transformed into a "printable" format (human readable). The idea is to allow the data to successfully navigate mediums designed only for text messages, such as e-mail or usenet.