What is electromagnetic pluse?

Answer 1

An electromagnetic pulse is a very powerful but very brief burst of electromagnetic noise; nuclear explosions in the atmosphere produce magnetic pulses. These can overload electronic equipment, by inducing powerful, brief currents. They are essentially like ridiculously powerful radio broadcasts that destroy the radios which receive them.

Answer 2

An electromagnetic pulse (EMP) is a burst of electromagnetic radiation that can disrupt or damage electronic devices and systems, causing them to malfunction or fail. EMPs can be generated naturally by events like lightning strikes or solar flares, or they can be created deliberately as a weapon using nuclear explosions or specialized devices.