A GFCI receptacle is different from conventional receptacles. In the event of a ground fault, a GFCI will trip and quickly stop the flow of electricity to prevent serious injury.
Definition of a ground fault: Instead of following its normal safe path, electricity passes through a person's body to reach the ground, For example, a defective appliance can cause a ground fault.
A GFCI receptacle does not protect against circuit overload, short circuits, or shocks. For example, you can still be shocked if you touch bare wires while standing on a non-conducting surface such as a wood floor.