Particle entanglement is a phenomenon in quantum mechanics where two or more particles become correlated in such a way that their properties, such as spin or polarization, become interconnected and dependent on each other, even when separated by large distances. Entanglement arises when particles interact in a way that their quantum states become entwined or entangled. Once entangled, the state of one particle is linked to the state of the other, regardless of the spatial separation between them. This phenomenon has been experimentally observed and verified in numerous experiments and is a key feature of quantum physics. The exact mechanisms underlying particle entanglement involve complex quantum principles such as superposition and measurement, and it continues to be an active area of research in quantum mechanics.