Gluons relating to quantum chromodynamics

[Gravitons]

I know gluons relating to quantum chromodynamics are the force that holds quarks or whole nuclei of the atom together, is it considered a particle, or since its a force,is it just representing something invisible, is it actually there, like quarks or protons and neutrons. The same with all bosons.

 

[ansgar]

The gluon has been found experimentally, just as all the other "force bosons"

http://en.wikipedia.org/wiki/Gluon#Experimental_observations