A collider is a type of particle accelerator that is used to collide particles at high energies in order to study their interactions and properties. Colliders are designed to accelerate particles, such as protons or electrons, to near the speed of light and then smash them together. By analyzing the debris produced in these high-energy collisions, scientists can study fundamental particles and forces in nature, such as quarks, leptons, and bosons. Colliders play a crucial role in experimental particle physics and have been instrumental in confirming the existence of the Higgs boson and other fundamental particles.