An electric spark is a visible discharge of electricity that occurs when there is a sudden flow of electric current through the air. This phenomenon typically happens when the voltage is high enough to overcome the air's resistance, creating a path for the current. Electric sparks can be seen in various situations, such as during lightning strikes or when static electricity builds up and discharges. Sparks are often associated with electrical devices and can be dangerous if not controlled. They can ignite flammable materials, leading to fires or explosions. Understanding electric sparks is important for safety in environments where electricity, static electricity, and flammable substances are present.