What system of measuring does the rest of the world use besides the US?

The rest of the world primarily uses the metric system for measuring, which is based on units such as meters for length, kilograms for mass, and liters for volume. This system is decimal-based, making it easier to convert between units by simply multiplying or dividing by powers of ten. The metric system is widely adopted in scientific, educational, and most everyday contexts, facilitating international communication and trade. In contrast, the United States primarily uses the customary system, which includes units like feet, pounds, and gallons.