Gravitational waves are disturbances in the fabric of space-time created by accelerating massive objects. They are ripples in the curvature of space-time, much like the ripples created by dropping a pebble in a pond. Gravitational waves can be generated by any source that produces extreme gravity. This includes the collision of two neutron stars, two black holes merging, or the decay of an ultra-dense neutron star. Gravitational waves pass through matter, so it is possible to measure them in distant galaxies. These waves can be used to study the universe in ways that have never been done before. For example, they could be used to measure the age and size of the universe, or how quickly it is expanding. They could also provide insight into the nature of gravity and dark matter. Gravitational wave observatories such as LIGO (the Laser Interferometer Gravitational-wave Observatory) exist around the world. These use high-precision instruments to detect gravitational waves and map out their signatures. By studying gravitational waves, we can gain a better understanding of how the universe works and how it came into existence. This is an exciting field of exploration, and there is still much to learn.