I understand that there are 4 fundamental "forces" of nature that we've identified; gravity, electromagnetism, and the two nuclear forces. However, I have been under the impression that gravity isn't a "force" in the same way that the others are. From what I figured, a force is something that has a field which permeates space - while gravity is the curvature of space/time itself. I suppose I was thinking that gravity feels like a force, even though it isn't really. Furthermore, I've found out that there is a hypothetical particle called the graviton which is analogous to the photon and electromagnetism. Why would a graviton even be necessary? I don't see how a gravitational wave needs anything to carry it. Adding to my confusion, the term "gravitational field". This is just a tool for explaining the interactions between masses, right? There is no literal gravitational field, right?