A kilogram (kg) is a unit of mass in the International System of Units (SI). It is defined as the mass of a specific platinum-iridium cylinder kept at the International Bureau of Weights and Measures. One kilogram is equivalent to 1,000 grams, making it a fundamental unit for measuring weight in everyday life. The kilogram is commonly used around the world for various applications, including cooking, science, and industry. It helps standardize measurements, ensuring consistency and accuracy. In many countries, the kilogram is the primary unit for labeling food products and other goods.