Periodization is the process or study of categorizing the past into discrete, quantified named blocks of time[1] in order to facilitate the study and analysis of history. This results in descriptive abstractions that provide convenient terms for periods of time with relatively stable characteristics. However, determining the precise beginning and ending to any "period" is often arbitrary. It has changed over time in history.

Periodisation
Periodisation is the process of dividing history into distinct periods or time frames based on key events, cultural shifts, or social developments. It helps scholars and historians organize and understand the complexity of history by breaking it down into manageable chunks.

Importance of Periodisation
- Helps in analyzing and understanding historical events in a more structured manner.
- Allows for better comparison between different time periods.
- Facilitates the study of cause and effect relationships in history.
- Helps in identifying patterns and trends over time.

Types of Periodisation
1. Political Periodisation: Dividing history based on changes in political systems, rulers, and government structures.
2. Cultural Periodisation: Focusing on cultural developments, artistic movements, and intellectual trends.
3. Social Periodisation: Examining changes in society, class structures, and demographic shifts.
4. Economic Periodisation: Studying economic systems, trade patterns, and technological advancements.

Examples of Periodisation
- Ancient History: Prehistoric Period, Classical Period, Middle Ages.
- Modern History: Renaissance, Industrial Revolution, World Wars.
- Contemporary History: Cold War Era, Post-Cold War Era, Globalization.

Challenges of Periodisation
- Overlapping periods due to the interconnected nature of history.
- Eurocentrism in traditional periodisation models.
- Difficulty in defining clear boundaries between periods.
In conclusion, periodisation is a valuable tool in historical analysis that helps in organizing and interpreting the complexities of the past. By identifying key periods and trends, historians can gain a deeper understanding of the forces that have shaped our world.