The Geological Time Scale is a system used by geologists and paleontologists to describe the timing and relationships of events in Earth's history. It divides Earth's 4.5 billion-year history into various intervals, such as eons, eras, periods, and epochs, allowing scientists to communicate about the timing of geological and biological events more effectively. This scale is crucial for understanding the evolution of life, as it provides a framework for dating fossils and rock layers. Major events, like the Cambrian Explosion and the extinction of the dinosaurs, are marked on this scale, helping to illustrate the dynamic changes that have shaped our planet over time.