Particles are sprites or game objects that are created and controlled by the particle system to simulate various graphical effects, mainly chaotic, natural phenomenon's, or chemical reactions that will otherwise be difficult to recreate with conventional rendering techniques. Fire, sparks of electricity, fireworks, dust, rain, snow, explosions, and magic spells—all can be created with the use of the particle system that is available in Unity.

I encourage you to take a look at some of the examples of particle systems available in Unity's standard package by navigating to Assets | Import Package | Particle Systems.

My personal favorite is the fireworks particle, it can be found under Standard Assets | ParticleSystems | Prefabs | Fireworks. In order to see a particle system in action, simply drag and drop it into the scene and keep it active (selected).

The best part is that all of that beauty can be created by an artist without a single line of code. How? Well, we have an...