In particle physics, there are four fundamental types of interactions: strong, weak, electromagnetic, and gravitational.

1. Strong Interaction: This is the most powerful of the four fundamental forces. It is responsible for holding the nucleus of an atom together, effectively binding quarks to form protons and neutrons. This interaction is mediated by particles known as gluons, which play a critical role in maintaining the stability of atomic nuclei.

2. Weak Interaction: The weak interaction governs the process of radioactive decay and is mediated by the W and Z bosons. Notably, this interaction is significantly weaker than both the strong and electromagnetic interactions, making it less prominent in everyday physical processes.

3. Electromagnetic Interaction: This force describes the interactions between charged particles and is mediated by photons. The electromagnetic interaction is fundamental to the behavior of light, electricity, and magnetism, influencing a wide range of physical phenomena.

4. Gravitational Interaction: As the weakest of the four fundamental forces, the gravitational interaction is responsible for the attraction between masses. It is theorized to be mediated by particles called gravitons, although these have yet to be observed in experiments.

Understanding these different types of interactions is essential for grasping the behavior of matter and energy at their most fundamental level. The field of particle physics has yielded numerous important discoveries, significantly enhancing our comprehension of the universe.