Schrödinger's Cat is a famous thought experiment proposed by physicist Erwin Schrödinger in 1935. It illustrates the concept of superposition in quantum mechanics, where a cat placed in a sealed box can be simultaneously alive and dead, depending on an unobserved quantum event. This paradox highlights the strange nature of quantum states and challenges our understanding of reality. The experiment serves to demonstrate the implications of quantum theory on macroscopic objects. Until the box is opened and an observation is made, the cat's fate remains uncertain, prompting discussions about the role of the observer in determining reality and the nature of existence itself.