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The Higgs Boson is a theoretical elementary, subatomic particle predicted to exist by the Standard Model of particle physics. It is the only Standard Model (SM) particle that has not yet been observed. 

According to the Standard Model, the Higgs particle is a boson, a type of particle that allows multiple identical particles to exist in the same place in the same quantum state. It has no spin, electric charge, or colour charge. It is also very unstable, decaying into other particles almost immediately. Some extensions of the Standard Model predict the existence of more than one kind of Higgs boson.

         The Higgs boson's existence would have profound importance in particle physics because it would prove the existence of the hypothetical Higgs field—the simplest  of several proposed explanations for the origin of the symmetry-breaking mechanism by which elementary particles acquire mass.  The leading explanation is that a field exists that has non-zero strength everywhere—even in otherwise empty space—and that particles acquire mass by interacting with this so-called Higgs field.

The Higgs particle is named after the British theorist Peter Higgs who along with Robert Brout and François Englert theorized its existence in 1964. The search for the Higgs remains one of the most important objectives of research in elementary particle physics today.