What is Large Hadron Collider used for?

Answer 1

It is a giant "toy" for physicist to crash individual atoms into each other. They use magnetic fields to get atoms moving as fast the can get them and crash them together. They do that to see what comes out, hence figuring out what atoms are made out of.

Answer 2

The Large Hadron Collider or LHC is the most powerful and complex particle collider to be created till date. It can produce energies of 0.64-92 microjoules which is huge for colliding nucleuses as heavy as lead. Hadrons are heavy particles (like mesons or pions) which require huge amounts of energies to be accelerated close to the speed of light. The LHC is able to do this easily till date.

By colliding protons and lead ions we may get a Higgs Boson which has the odds of around 1 in 10 billion collisions. So this can be achieved only by a complex and highly efficient particle accelerator such as the LHC.