Electrostatic Discharge (ESD) is a spark, like a miniature flash of lightning, that jumps from one charged conductive surface to another conductive surface. This very rapid movement of astatic (not moving) charge can cause fire, explosions, EMI, RF, heat, light and even noise. It can cause irreparable damage to electronics. Therefore, these invisible, inaudible and often unnoticed sparks need to be controlled.
The term ESD is used in the electronics industry and other industries to indicate temporary adverse movements that can cause damage to electronic equipment.