Quantum entanglement is a phenomenon in quantum physics where two or more particles become interconnected in such a way that the state of one particle instantly influences the state of the other, regardless of the distance between them. This means that if you measure one particle, you can immediately know the state of the other, even if it is light-years away. This strange connection challenges our classical understanding of physics and has implications for fields like quantum computing and quantum cryptography. Researchers are exploring how quantum entanglement can be harnessed for faster information processing and secure communication systems.