The Higgs boson is important because it is a key component of the Higgs field, which is a fundamental field of the universe that is thought to give other particles mass. The discovery of the Higgs boson confirmed the existence of the Higgs field and provided evidence for the mechanism by which particles acquire mass, which is a fundamental aspect of the universe. It also completes the standard model of particle physics, which describes the fundamental particles and interactions that make up our universe.