"Subatomic" refers to particles that are smaller than an atom. Atoms, the building blocks of matter, consist of a nucleus made up of protons and neutrons, surrounded by electrons. Subatomic particles include these protons, neutrons, and electrons, as well as other particles like quarks and neutrinos. Understanding subatomic particles is essential in fields like physics and chemistry. The study of subatomic particles helps scientists explore the fundamental forces of nature, such as the strong force and electromagnetism. Research in this area has led to significant advancements, including the development of technologies like semiconductors and nuclear energy.