Schrödinger's cat is a thought experiment created by physicist Erwin Schrödinger in 1935 to illustrate the concept of superposition in quantum mechanics. In this scenario, a cat is placed in a sealed box with a radioactive atom, a Geiger counter, and a vial of poison. If the atom decays, the Geiger counter triggers the release of the poison, resulting in the cat's death. Until the box is opened, the cat is considered both alive and dead simultaneously, representing the strange nature of quantum states. This paradox highlights the difference between quantum mechanics and classical physics. In classical terms, the cat must be either alive or dead, but quantum mechanics allows for multiple states to exist at once. The thought experiment raises questions about observation and reality, emphasizing how measurement affects the state of a system.