Most countries around the world use the metric system of measurement, which includes units such as meters for length, kilograms for mass, and liters for volume. The metric system is favored for its simplicity and scalability; it employs a decimal-based approach, making calculations easier. The system has been adopted by nearly all countries, with a few exceptions like the United States, which still uses the imperial system for many applications. The consistency and universality of the metric system facilitate international trade, scientific research, and communication, promoting global understanding and cooperation.