There are four fundamental forces in physics, responsible for all interactions in the universe:

1. Strong Force: This force holds the nucleus of an atom together by binding protons and neutrons. It's the strongest force, but it acts over very short distances.

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

3. Weak Force: This force is responsible for radioactive decay, where particles like neutrons can decay into protons, electrons, and neutrinos. It's much weaker than the strong force but acts over longer distances.

4. Gravitational Force: This force is the weakest force, but it acts over very long distances and is responsible for the attraction between objects with mass. It governs the motion of planets, stars, and galaxies.

Here's a quick table summarizing the fundamental forces:

| Force | Description | Relative Strength | Range |

|---|---|---|---|

| Strong Force | Holds atomic nuclei together | Strongest | Very short (1 femtometer) |

| Electromagnetic Force | Governs interactions between charged particles | Medium | Infinite |

| Weak Force | Responsible for radioactive decay | Weak | Very short (10^-18 meters) |

| Gravitational Force | Attraction between objects with mass | Weakest | Infinite |

Note: There are theoretical models that attempt to unify these forces into a single, more fundamental force, such as "Grand Unified Theories" and "String Theory," but these are still being researched and tested.