Time measurement is the process of quantifying the passage of time using various tools and methods. The most common unit of time is the second, which is part of larger units like minutes, hours, and days. People have created devices such as clocks and watches to help keep track of time, allowing us to organize our daily activities and schedules. Throughout history, different cultures have developed their own systems for measuring time. For example, the ancient Egyptians used sundials, while the Chinese created water clocks. Today, we rely on precise instruments like atomic clocks, which measure time based on the vibrations of atoms, ensuring accuracy in our modern world.