How is the formation of sparks in lightning?

Lightning is formed when static electricity builds up in clouds due to the collision of ice particles and water droplets. This creates a separation of charges, with positive charges accumulating at the top of the cloud and negative charges at the bottom. When the electrical potential difference becomes strong enough, it causes a rapid discharge of electricity, resulting in a bright flash known as a spark or lightning bolt. This discharge heats the surrounding air to extreme temperatures, producing the characteristic thunder that accompanies lightning.