Why are gravitational mass and inertial mass identical?

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Gravitational mass, or the degree to which an object can exert a gravitational force, is directly equivalent to its inertial force, or its resistance to acceleration. Can anyone explain why these two things are so closely correlated? Why do we use both when they are effectively interchangeable?

What is the reason that an object’s gravitational influence must be exactly equivalent to its resistance to external forces?

In: Physics

Gravitational mass and inertial mass are only conceptually different. In classical mechanics, they are the same thing as taken as an empirical fact. In the theory of general relativity, they are the same thing under the equivalence principle.

The terms we use to denote things are dependant on the things, not the other way around.