Entangled particles are pairs of particles that become linked in such a way that the state of one particle instantly influences the state of the other, regardless of the distance separating them. This phenomenon is a key feature of quantum mechanics and challenges our classical understanding of how particles interact. When two particles are entangled, measuring a property, such as spin or polarization, of one particle will immediately determine the corresponding property of the other particle. This relationship persists even if the particles are light-years apart, leading to discussions about concepts like quantum communication and quantum computing.