1. The metric system is an international decimalized system of measurement. 2. It is based on the meter (length), kilogram (mass), and second (time) as its base units. 3. The system uses prefixes like kilo-, centi-, and milli- to denote multiples or fractions of these base units. 4. It is widely used in science, industry, and everyday life worldwide. 5. For example, 1 kilometer equals 1000 meters, and 1 milligram equals 0.001 grams.