The metric system is a decimal-based system of measurement used worldwide. It includes units such as meters for length, liters for volume, and grams for mass. 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 metric system is essential in science, industry, and everyday life. It provides a common language for measurements, facilitating international trade and communication. Key components of the metric system include the International System of Units (SI), which standardizes measurements across various fields.