How do historians divided the pasts into periods?

Historians divide the past into periods to create a structured framework for studying and understanding historical developments. These divisions are often based on significant events, cultural shifts, technological advancements, or social changes, such as the transition from the ancient to the medieval period. The use of defined time frames, like the Renaissance or the Industrial Revolution, helps historians analyze patterns, draw comparisons, and contextualize historical narratives. Such categorization also aids in organizing educational curricula and guiding research methodologies.