<human>:  Can you explain the concept of quantum entanglement?
<bot>: Quantum entanglement is a phenomenon in which particles that have interacted remain inextricably linked, regardless of their separation in space, sharing properties like spin or polarization. This means that when one particle is measured or has its properties changed, the other particle is instantly affected by the same change, even if the two particles are separated by massive distances. This happens even if the two particles are traveling at the speed of light. Quantum entanglement is considered to be one of the most important features of quantum mechanics and is widely used in quantum computing and cryptography.