Subatomic particles are tiny, invisible particles that make up all matter in the universe. They are smaller than atoms and can only be observed through highly technical equipment such as particle accelerators or detectors. There are several types of subatomic particles including protons, neutrons, electrons, quarks, leptons, mesons, and bosons. These particles have different properties and behaviors, but they all interact with each other in ways that determine the characteristics of matter. Understanding subatomic particles is essential to understanding how the universe works at its most basic level.