# Fundamental interaction | | In physics, the **Fundamental interaction**s or fundamental forces are the interactions that do not appear to be reducible to more basic interactions. There are four fundamental interactions known to exist:gravity electromagnetism weak interaction strong interaction | |-|-| | | wikipedia:: [Fundamental interaction](https://en.wikipedia.org/wiki/Fundamental_interaction) | [[Electromagnetism]] [[Gravity]] [[Weak interaction]] [[Strong interaction]]