Proton collisions refer to experiments in which protons are accelerated to high energies and made to collide with each other. These collisions are typically studied in particle physics experiments to investigate the fundamental particles and forces that make up the universe. Proton collisions are conducted in particle accelerators such as the Large Hadron Collider (LHC) at CERN, where scientists study the resulting particles and interactions to gain insight into the nature of matter and the fundamental laws of physics. This research area plays a crucial role in advancing our understanding of particle physics and the fundamental building blocks of the universe.