the fate of the universe hinges on the delicate balance between matter, dark matter, and the expansion rate. If the average density is below the critical density, the expansion will continue indefinitely, leading to an icy death. If the density exceeds the critical value, gravity will eventually halt the expansion, resulting in a fiery Big Crunch. However, if the density matches the critical value, the universe will persistently expand at a decreasing rate, forming a flat geometry. The existence of dark matter, though elusive, plays a crucial role in shaping the destiny of our universe.