What are the key differences between electromagnetism and gravity?

Electromagnetism and gravity are two fundamental forces in nature. Electromagnetism is a force that acts between charged particles, such as electrons and protons, and is responsible for interactions between electric and magnetic fields. Gravity, on the other hand, is a force that acts between all objects with mass and is responsible for the attraction between objects like planets and stars. One key difference is that electromagnetism can be attractive or repulsive, while gravity is always attractive. Additionally, electromagnetism is much stronger than gravity at the atomic and molecular level, but gravity dominates on larger scales, such as in the motion of planets and galaxies.