In physics, weight is defined as the force of gravity acting on an object. It's the measure of how strongly gravity pulls an object towards a celestial body like the Earth. Weight is a vector quantity, meaning it has both magnitude and direction.
Weight VS Mass
Weight is the force of gravity acting on an object's mass, whereas mass is the amount of substance in the thing. Weight varies according to the gravitational force acting on the object, whereas mass stays constant regardless of location. For instance, an object's weight would change on the Moon because of its weaker gravity even though its mass would be the same on Earth.