Subatomic particles are particles that are smaller than an atom. Historically subatomic particles were considered to be electrons, protons, and neutrons. However, the definition of subatomic particles has now been expanded to include elementary particles and all the particles they can be combined to make.

Elementary particles are particles that cannot be divided up into smaller particles. There are two types of elementary particles. One type of elementary particles make up matter. Examples of these particles include electrons and quarks (which make up protons and neutrons). Baryons and mesons are combinations of quarks and are considered subatomic particles. The most famous baryons are protons and neutrons.

The other elementary particles are mediators of the fundamental forces. These mediator particles enable the matter particles to interact with each other. To illustrate this idea, let's say two boys want to play catch. The boys represent the matter particles...