A century, or 100 years, is a significant period in human history. It is often used to mark important events, changes, and developments in society, technology, and culture. For example, the 20th century saw major advancements such as the invention of the internet and the rise of globalization. In terms of measurement, 100 years can be divided into decades, with each decade representing ten years. This time frame allows historians to analyze trends and shifts over generations, such as the impact of World War II or the evolution of civil rights movements.