Gravity waves are ripples in space and time caused by the acceleration of massive objects. These waves were first predicted by Albert Einstein's general theory of relativity, but they weren't directly observed until 2016 when scientists detected them using highly sensitive instruments. Gravity waves can be produced by events such as collisions between black holes or neutron stars, supernovae explosions, and even the rapid expansion of matter in the early universe. They provide a unique way to study these cosmic events and have opened up new possibilities for understanding the fundamental nature of space-time.