It allow you to disconnect power to an electrical device with the flip of a switch.
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If you get sparking in an electrical switch there is a loose connection or short in the circuit. The switch should be repaired or replaced.
No, an electrical approved switch is used to break an electrical circuit.
switch socket outlet
If it is a physical switch, this is called a "relay" or a "contactor". If it is a semiconductor device, it is typically a triac, SCR or a thyristor.
In electrical terminology it is known as a single pole double throw switch.