So gravity is not a force

In the context of Newtonian physics, gravity is indeed described as a force. It's the gravitational force of attraction between objects with mass.

However, in Einstein's theory of General Relativity, gravity is described differently. It's not a force in the traditional sense, but rather a curvature of spacetime caused by mass and energy. Objects follow the curves in spacetime, and we perceive this motion as the effect of gravity.

So, whether gravity is considered a force depends on the physics framework you are using. Both descriptions are valid within their respective theories.