The SI unit for mass is the kilogram, abbreviated as kg.
The kilogram is one of the seven base SI units and is defined as being equal to the mass of the International Prototype of the Kilogram, a cylinder made of platinum-iridium that was maintained in France until 2019. Since then, the kilogram has been redefined based on fixed numerical values of fundamental constants, specifically the Planck constant.
The kilogram is widely used in science and everyday life when measuring mass. It allows for consistency in measurements around the world, should you be comparing weights in the kitchen or scientific experiments in a lab.