Colour force, a fundamental interaction in quantum physics, is responsible for holding quarks together within protons and neutrons. This force is mediated by particles called gluons, which carry the strong force and exhibit unique properties such as confinement and asymptotic freedom. Unlike electromagnetic forces, colour force does not diminish with distance; instead, it strengthens, preventing quarks from existing independently. The concept is essential for understanding the behavior of particles in quantum chromodynamics (QCD), the theory that describes strong interactions. Overall, colour force plays a crucial role in the stability of atomic nuclei and the formation of matter.