Gravitational Mass

Gravitational mass is the strength of its gravitational interaction with other objects.  In simple terms, it's a measure of how much an object responds to the force of gravity.  Gravitational mass is what we typically think of when we talk about mass in everyday life, such as the mass of an apple or a planet. It's what causes objects to be attracted to each other due to gravity.  According to the equivalence principle of general relativity, gravitational mass is also equivalent to inertial mass, which is the resistance of an object to changes in its motion when subjected to a force.