In particle physics, the Higgs boson know as God particle is a massive scalar elementary particle predicted to exist by the Standard Model. The clustering effect is the Higgs mechanism, postulated by British physicist Peter Higgs in the ’60s. The theory hypothesizes that a sort of lattice, referred to as the Higgs field, fills the universe. This is something like an electromagnetic field, in that it affects the particles that move through it, but it is also related to the physics of solid materials. [...]

The Higgs boson is the only Standard Model particle that has not yet been observed.  Experimental detection of the this boson would help explain how massless elementary particles can have mass. More specifically, the Higgs boson would explain the difference between the massless photon, which mediates electromagnetism, & the massive W and Z bosons, which mediate the weak force. If the Higgs boson exists, it is an integral & pervasive component of the material world.

Higgs suggested that all particles had no mass just after the Big Bang. As the Universe cooled & the temperature fell below a critical value, an invisible force field called the ‘Higgs field’ was formed together with the associated ‘Higgs boson’. The field prevails throughout the cosmos: any particles that interact with it are given a mass via the Higgs boson. The more they interact, the heavier they become, whereas particles that never interact are left with no mass at all. [...]

http://en.wikipedia.org/wiki/Higgs_boson
http://www.exploratorium.edu/origins/cern/ideas/higgs.html
http://public.web.cern.ch/public/en/Science/Higgs-en.html