“Universal Science” on Gravity

This article lost me at: “This is consistent with Einstein’s General Theory of Relativity, which remains the best means of describing gravity’s behavior. According to this theory, gravity is not a force, but a consequence of the curvature of spacetime caused by the uneven distribution of mass/energy.”  If not a force, what is gravity?  Can anyone help? John
https://bit.ly/2qCOQES