Questions pertaining to a group of particles which can be used to simulate a system of chaotic objects(known as particle systems). Particle systems in Blender are robust and full of settings.

Particles are lots of items emitted from mesh objects, typically in the thousands. Each particle can be a point of light or a mesh, and be joined or dynamic. They may react to many different influences and forces, and have the notion of a lifespan. Dynamic particles can represent fire, smoke, mist, and other things such as dust or magic spells.

Hair type particles are a subset of regular particles. Hair systems form curves that can represent hair, fur, grass and bristles.

Particles at The Blender Manual