A particle is a free 3D coordinate. Particle rendering refers to several visualization techniques to visualize a volumetric system which focus on minimizing per particle work load:<p><a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Particle_system" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Particle_system</a><p>A voxel is a value in a 3D lattice.<p><a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Voxel" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Voxel</a><p>A particle system could be used to visualize a voxel field, of course, but their application range is far wider.