Elementary particles are the fundamental constituents of matter and radiation in the universe. According to the current understanding in particle physics, especially as described by the Standard Model, elementary particles are not made up of smaller particles; they are the most basic building blocks of the universe. Elementary particles can be classified into two main categories: 1. **Fermions**: These are the particles that make up matter. They have half-integer spin (e.g., 1/2, 3/2).
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The opposite of quasiparticle, see notaby: quasiparticles vs elementary particles.