Dark energy is an unidentified force believed to account for approximately 68% of the total energy in the universe. Recent research indicates that dark energy may be undergoing changes that are difficult to explain within current standards of physics. These findings suggest that the properties of dark energy, such as its density and influence on the universe’s expansion, could be variable over cosmological timescales. Such variability reflects challenges to existing models, which often assume dark energy remains constant or behaves uniformly throughout cosmic history. The possible evolution of dark energy’s characteristics might have profound implications for the universe’s ultimate fate. If dark energy continues to increase or change unpredictably, it could lead to a scenario in which the universe’s expansion accelerates to the point of ending in a ‘Big Freeze’. Conversely, if dark energy diminishes or reverses, the universe might eventually contract in a ‘Big Crunch’. These hypotheses depend heavily on ongoing observational data and theoretical developments, which strive to refine understanding of the universe’s fundamental forces. Current scientific efforts continue to investigate the nature of dark energy to clarify whether these changes exist and what they imply for cosmic evolution.