Electricity moves in the metal part of a wire. The metal should be covered with plastic.
This wire is damaged.

Anyone touching the metal would get an electric shock and could die. Never use a damaged wire.
Never put anything into the holes of a wall socket. The metal parts inside could give you an electric shock.

Mains electricity can move through water. Never touch anything that uses mains electricity with wet hands.
Never use mains electricity near water.