A spark lighter, also called a flint lighter or a flint spark lighter, is a type of lighter that is used to safely light a gaseous fuel to start a flame.
A spark lighter uses the principle of piezoelectricity. This is when a small hammer like device is spring loaded in the igniter so that when it hits a piece of quartz crystal. When this crystal becomes deformed it is able to produce an electrical discharge which in turn is able to ignite the gas and create a flame.