The Chernobyl disaster occurred in Ukraine on April 26, 1986, when a nuclear reactor at the Chernobyl Nuclear Power Plant exploded, releasing a significant amount of radioactive particles into the atmosphere. The incident is considered the worst nuclear disaster in history, leading to long-term environmental contamination and health issues for those exposed to radiation. An entire city, Pripyat, was evacuated, and a 30-kilometer exclusion zone was established. The fallout raised global awareness of the risks associated with nuclear power and highlighted the need for improved safety measures, leading to changes in policies and practices regarding nuclear energy worldwide.