Masses refer to the quantity of matter in an object, typically measured in units like grams or kilograms. It is a fundamental property of physical objects and is crucial in understanding concepts in physics, such as gravity and inertia. The mass of an object affects how it responds to forces and how it interacts with other objects. In everyday life, the mass of an object can influence its behavior. For example, a heavier object, like a car, requires more force to accelerate than a lighter object, like a bicycle. Understanding mass helps in various fields, including engineering, astronomy, and nutrition, where it plays a vital role in calculations and assessments.