1. Strong Nuclear Force: This force holds the nucleus of an atom together, overcoming the electrostatic repulsion between protons. It is the strongest force in the universe but has a very short range.

2. Electromagnetic Force: This force governs interactions between electrically charged particles. It is responsible for phenomena like electricity, magnetism, and light.

3. Weak Nuclear Force: This force is responsible for radioactive decay and certain types of nuclear reactions. It is much weaker than the strong nuclear force and has a short range.

4. Gravitational Force: This force is responsible for the attraction between objects with mass. It is the weakest of the four forces but has an infinite range. It governs the orbits of planets, the formation of galaxies, and the expansion of the universe.

These four fundamental forces are believed to be responsible for all interactions in the universe.