A century is a time period consisting of 100 years. It is commonly used to measure significant periods in history, marking the completion of one hundred years. For example, the 20th century spans from 1901 to 2000, and the 21st century began in 2001 and will end in 2100. A century is always defined as 100 years, and it follows the standard structure of the Gregorian calendar, which is the most widely used calendar system. The concept of a century helps in understanding historical eras, developments, and the passage of time.
