Entangled photons are pairs of light particles that are linked in such a way that the state of one photon instantly influences the state of the other, regardless of the distance between them. This phenomenon arises from the principles of quantum mechanics, where particles can exist in multiple states simultaneously until measured. When two photons are entangled, measuring the polarization or other properties of one photon will immediately determine the corresponding properties of the other photon. This unique relationship has important implications for fields like quantum computing, quantum cryptography, and the study of fundamental physics, challenging our understanding of locality and information transfer.