Quantum mechanics holds the distinction between point particles or elementary particles with composite particles.
An elementary particle, such as a quark, electron or photon, is a particle with no internal structure. It is not composed of other particles. A composite particle, on the other hand, such as a proton or neutron, have internal structure. For example, a proton is composed of two up quarks and a down quark bound by gluons.
The particles currently thought to be fundamental are the fermions: quarks (up, down, charm, strange, top, bottom) and leptons (electron, electron neutrino, muon, muon neutrino, tau, tau neutrino), and the bosons: gauge bosons (gluon, photon, Z Boson, W Boson) and the scalar boson (Higgs).
A particle containing two or more fundamental particles is known as a composite particle.