Does gravity hold things together?

  Gravity is an attractive force. All masses exert gravity, so matter pull toward each other. However, it is only significant when the masses are large, like that of Earth.  Exactly what causes gravity still remains a mystery. Since all the other three fundamental forces (strong, weak, and electromagnetic) are caused by particles called bosons, some scientists think that gravity is caused by particles called the graviton. However, such a particle has not yet been observed, and its existence has not been proven yet. 
Also, gravity does not hold EVERYTHING together, as another person has already mentioned. Static electricity holds your socks together after they come out of the dryer, not gravity. Also, gravity is too weak to hold together, say, the nucleus of atoms, or even atoms of molecules together.

Yes, Gravity is the force that holds everything one this Earth from flying away such as building and humans. The gravity is different for each planet as well. Earth has a gravity of one, and planets smaller than Earth have a Gravity lower than one meaning you can jump higher, because the force isn't strong enough to bring quickly. Planets bigger than Earth have a Gravity greater than 1 that allows for smaller jumps because they can bring you down quicker. There is gravity between the Earth and the Moon, and the Sun and all 8 Planets. In conclusion Gravity does hold things together.

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