They are known as the strong and weak nuclear forces. It is the job of the strong nuclear force to hold atomic nuclei together and govern the way they behave. The weak nuclear force governs interactions concerning neutrinos. It is the job of the electromagnetic force to hold electrons around atomic nuclei and to be the driving force in all chemical reactions. Finally, it is the job of gravity to bind individual objects to one another.
Gravity is the attractive force that acts between objects with mass.
The greater the mass of two objects, the greater the force of their mutual attraction. The further the bodies are moved away from one another, however, the weaker the force of gravity between them. This is because gravity follows something called an inverse square law. Gravity is the weakest of the fundamental forces and yet, it has an unlimited range. This is why gravity shapes the universe on its largest scales, because it acts over such vast distances.