Unlike the two forces that were talking above, the force of gravity provides a clear example of ``action at a distance''. Two objects don't need to be in contact to attract or repel each other. Try having a garlic burger if you want to see how this works.
If we take a banana split of mass m and drop it. It accelerates with an acceleration of g pointing down. It's the only force acting on the banana split so Newton's second law says that the force of gravity is mg pointing down.