Electromagnetic Force: This force is due to the interaction between charged particles. Protons are positively charged, and like charges repel each other according to Coulomb's law. So, the electromagnetic force between two protons is repulsive.

Gravitational Force: This force is based on the mass of the objects and the distance between them. While gravity is a very weak force compared to electromagnetism, it still exists between any two masses, including protons. However, the gravitational force between two protons is extremely weak compared to the electromagnetic force.