An EMP (Electromagnetic Pulse) is a brief, intense burst of electromagnetic energy that can disrupt, damage, or destroy electronic devices and power grids over wide areas, often caused by high-altitude nuclear explosions, solar flares (GMD), or specialized non-nuclear weapons. These invisible energy surges create damaging currents in wires and circuitry, leading to widespread blackouts and technological failure, with potential impacts on communications, finance, and emergency services, though not directly harmful to people.