GFCI stands for:

A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds the…

What is a Ground Fault?

2020 National Electrical Code Chapter 1 General Article 100, Definitions Section:Ground Fault An unintentional, electrically conductive connection between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors,…