The Metrical System, also known as the Metric System, is a decimal-based system of measurement used worldwide. It includes units such as meters for length, kilograms for mass, and liters for volume. The system is designed to be simple and consistent, making it easier to convert between units by using powers of ten. Adopted by most countries, the Metrical System facilitates international trade and scientific communication. It is based on standard units defined by the International System of Units (SI), which includes additional units like the joule for energy and the hertz for frequency.