the.com/prompter

means Someone positioned off-stage (or off-screen) whose job is to feed lines to someone else who gets the credit for saying them.

from From French "prompteur," rooted in Latin "promptus" — ready, brought forth, at hand — the same root that gives us "prompt" as in quick and ready. The theater sense is old and literal: a person tucked in a box at the front of the stage, script open, hissing forgotten lines to actors. The word has simply moved into a new wings — the actor now runs on code, but someone still has to feed it its lines.