Dark matter is a mysterious form of matter that makes up approximately 27% of the universe, yet it does not interact with light or other forms of electromagnetic radiation, making it invisible and difficult to detect. Scientists believe that dark matter plays a crucial role in the formation and structure of galaxies and galaxy clusters, as its gravitational pull helps to hold them together. Despite its importance, the true nature of dark matter remains unknown, and researchers are actively studying it through various methods such as particle accelerators, astronomical observations, and computer simulations. Understanding dark matter is a key goal in modern cosmology as it could provide insights into the fundamental nature of the universe.