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According to my research, **quark** is the smallest particle. So far there's nothing smaller inside an atom than quarks. Quarks are the smallest particles that are point-like which are the constituent particles of neutrons and protons. Neutrinos, quarks and electrons (and leptons in general) are all point-masses.

However, there's another theory.**According to the string theory, the smallest fundamental particle is a string.** __This string that we are talking about is not a cord stretched across musical instrument okay?__ **It is a hypothetical one-dimensional entity or object. It is a fundamental component of matter.** **A string has length equal to*** Planck Length*, which is also the smallest possible length.

*Planck Length is the smallest size observable in our universe.*

However, there's another theory.