The Large Hadron Collider is the world's largest and highest-energy particle collider. It was built by the European Organization for Nuclear Research between 1998 and 2008 in collaboration with over 10,000 scientists and hundreds of universities and laboratories, as well as more than 100 countries. -Wikipedia
Its Purpose?
The LHC was built to help scientists to answer key unresolved questions in particle physics. The unprecedented energy it achieves may even reveal some unexpected results that no one has ever thought of! - https://public-archive.web.cern.ch/en/lhc/WhyLHC-en.html