The "Uncertainty Principle" is a fundamental concept in quantum mechanics, primarily associated with Werner Heisenberg. It states that certain pairs of physical properties, like position and momentum, cannot be precisely measured at the same time. The more accurately you know one property, the less accurately you can know the other. This principle highlights the inherent limitations in our ability to predict the behavior of particles at the quantum level. This principle challenges classical physics, where it was assumed that all properties could be measured simultaneously with arbitrary precision. In quantum mechanics, however, the Uncertainty Principle reveals a fundamental limit to measurement, emphasizing the probabilistic nature of particles and their behaviors, which is a key aspect of the quantum world.