A Hadron Collider is a type of particle accelerator that collides hadrons, which are subatomic particles like protons and neutrons. These machines are designed to smash particles together at very high speeds, allowing scientists to study the fundamental components of matter and the forces that govern their interactions. The most famous example is the Large Hadron Collider (LHC) located at CERN in Switzerland. By creating conditions similar to those just after the Big Bang, hadron colliders help researchers explore questions about the universe's origins and the nature of dark matter. They can also lead to discoveries of new particles, such as the Higgs boson, which was confirmed in 2012 through experiments at the LHC.