Weight is the measure of the force exerted on an object due to gravity. It is commonly measured in units such as pounds or kilograms. The weight of an object can change depending on its location; for example, an object weighs less on the Moon than on Earth because the Moon has weaker gravity. Weight is different from mass, which is the amount of matter in an object and remains constant regardless of location. While mass is measured in grams or kilograms, weight is calculated by multiplying mass by the acceleration due to gravity, typically 9.81 m/s² on Earth.