The story
The term was first used in passing by Peter Brusilovsky in a 1994 paper, but only entered common use in 2011 with the publication of an essay by Bret Victor.
Etymology from Wiktionary, CC BY-SA 4.0.
explorable explanation
Today it means: A form of informational media that presents an interactive computer simulation of a given concept, along with guidance to the audience of learners. Full definition →