The theoretical Higgs Boson is a theory (a calculated idea) for a basic sub-atomic particle that imparts mass or weight to the other sub-atomic particles that we call “matter”.

It’s been nicknamed the God Particle, as if it exists it will be the thing that literally makes the difference between matter and energy.  Or to put it another way, (if it exists) it’s the thing that makes us not beings of light. 

Many deep possibilities there.