A gluon is a massless particle that mediates the strong nuclear force, which is responsible for holding quarks together to form protons, neutrons, and other particles known as hadrons. Gluons are elementary particles and are not directly associated with electromagnetic interactions, which are responsible for the phenomenon of light.
Therefore, a free gluon would not be considered a form of light but rather its own massless particle. It is important to note that gluons are typically confined within hadrons and are not observed as free particles in isolation due to the nature of the strong force. They are only directly detected in high-energy particle physics experiments where quarks and gluons are produced in the process.