The Doomsday Clock is a symbolic representation of how close humanity is to a global catastrophic event, especially one involving nuclear weapons. It was created by the Bulletin of the Atomic Scientists, a group of scientists and experts who were involved in the Manhattan Project that developed the first nuclear weapons during World War II.

The Doomsday Clock is a visual representation of a countdown to midnight, where midnight represents the end of the world or the apocalypse. The closer the clock is to midnight, the closer humanity is to a global catastrophe. The clock was first introduced in 1947 and has been adjusted numerous times since then based on the perceived level of danger.

Initially, the clock was set at seven minutes to midnight, and since then, it has been adjusted 24 times. The latest update was made in 2021, when the clock was moved to 100 seconds to midnight, the closest it has ever been to midnight. This was due to a combination of factors, including the ongoing threat of nuclear war, the climate crisis, and the COVID-19 pandemic.

The Doomsday Clock serves as a reminder of the potential consequences of human actions and encourages people to take steps to prevent a global catastrophe.