The uncertainty principle, proposed by Werner Heisenberg in 1927, 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 arises from the wave-particle duality of quantum mechanics, which states that particles can exhibit both wave-like and particle-like behavior. To illustrate this concept, consider a particle like an electron. If we measure its position with great accuracy, then its momentum will become uncertain. This is because the act of measuring the position of the electron disturbs its momentum, making it impossible to know both values simultaneously. One way to remember the uncertainty principle is through a thought experiment involving a photon and a screen with two slits. When the photon passes through the slits, it behaves like a wave, creating an interference pattern on the screen. However, when we try to determine which slit the photon went through, the act of measurement collapses the wave function, destroying the interference pattern. In conclusion, the uncertainty principle highlights the fundamental limitations of our knowledge at the quantum level. It challenges our classical intuitions about the determinacy of particles and reminds us of the inherently probabilistic nature of the quantum world.