How does gravity differ from other fundamental forces?

These particles are what transmit the force: the photon transmits the electromagnetic force; the W and Z bosons transmit the weak nuclear force; the pions and, more recently, the gluons transmit the strong nuclear force.

In contrast, Einstein's General Theory of Relativity states that gravity is a result of space time's curvature.

Although there is no proof that a graviton particle actually exists, theories exist regarding a particle that transmits the gravitational force.

Gravity is unique among the four fundamental forces because it is the only force that acts on all particles with mass and energy, regardless of their electric charge. It is also the weakest of the four fundamental forces, with a strength that is approximately 10^38 times weaker than the strong nuclear force, which is the strongest of the four fundamental forces. Additionally, gravity is the only force that is always attractive, meaning that it always pulls objects toward each other, whereas the other three fundamental forces can be either attractive or repulsive, depending on the charges of the particles involved. Finally, gravity is the only fundamental force that is not described by a quantum field theory, which means that it is not currently understood in the same way as the other three fundamental forces.