The Copenhagen Interpretation is a fundamental concept in quantum mechanics, primarily developed by physicists Niels Bohr and Werner Heisenberg in the early 20th century. It suggests that quantum particles, like electrons, do not have definite properties until they are measured. Instead, they exist in a state of probability, described by a mathematical function called a wave function. When a measurement occurs, the wave function collapses, and the particle assumes a specific state. This interpretation emphasizes the role of the observer in determining the outcome of quantum events, leading to philosophical discussions about the nature of reality and observation in the quantum world.