A nuclear explosion occurs when a nuclear weapon detonates, releasing a massive amount of energy in the form of an explosion. This energy comes from nuclear reactions, either fission (splitting atomic nuclei) or fusion (combining them). The explosion generates a fireball, shockwave, and intense heat, causing widespread destruction. The effects of a nuclear explosion can be devastating, leading to immediate loss of life and long-term environmental damage. Areas affected may experience radiation, which can harm living organisms and contaminate the environment. The aftermath often requires extensive recovery efforts and raises concerns about safety and security related to nuclear technology, such as nuclear power plants and nuclear weapons.