The quantum uncertainty principle is a fundamental principle in quantum mechanics that asserts a fundamental limit on our ability to precisely measure certain pairs of properties of a quantum system.
It was first formulated by Werner Heisenberg and is often illustrated with the most famous example, the position-momentum uncertainty principle. It states that the more precisely we know the position of a particle, the less precisely we can know its momentum, and vice versa.
This principle is not due to limitations in our measurement tools but is an inherent property of quantum systems. It challenges our classical intuition and has profound implications for our understanding of the behavior of particles at the quantum level.