Feynman diagrams are pictures that show how particles interact. They can help us understand the strange things that happen when particles are very close together, like when they collide or join forces in a very energetic way.
In the diagrams, particles are represented as lines. Each straight line shows the path of a particle, from the starting point at one end, to the end point at the other end. The curved lines represent virtual particles, which are particles that exist only very briefly.
These diagrams help scientists figure out the kinds of things that can happen in such energetic interactions -- like how particles can be created or destroyed, and what kind of energy is released in the process. They can help us get a better understanding of how particles behave.