1. Strong Nuclear Force: This is the strongest force in the universe, responsible for holding the nucleus of an atom together. It acts over extremely short distances and is responsible for the interactions between protons and neutrons.

2. Electromagnetic Force: This force governs the interactions between electrically charged particles. It is responsible for phenomena like electricity, magnetism, and light. It's much weaker than the strong force but acts over much longer distances.

3. Weak Nuclear Force: This force is responsible for radioactive decay, a process where unstable atomic nuclei release particles. It is weaker than the electromagnetic force and also acts over short distances.

4. Gravitational Force: This is the weakest of the four forces, but it acts over vast distances. It is responsible for the attraction between any two objects with mass, including planets, stars, and galaxies.