A quark is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. All commonly observable matter is composed of up quarks, down quarks and electrons. Owing to a phenomenon known as color confinement, quarks are never found in isolation; they can be found only within hadrons, which include baryons (such as protons and neutrons) and mesons, or in quark–gluon plasmas.For this reason, much of what is known about quarks has been drawn from observations of hadrons. Quarks have various intrinsic properties, including electric charge, mass, color charge, and spin. They are the only elementary particles in the Standard Model of particle physics to experience all four fundamental interactions, also known as fundamental forces (electromagnetism, gravitation, strong interaction, and weak interaction), as well as the only known particles whose electric charges are not integer multiples of the elementary charge. There are six types, known as flavors, of quarks: up, down, charm, strange, top, and bottom. Up and down quarks have the lowest masses of all quarks. The heavier quarks rapidly change into up and down quarks through a process of particle decay: the transformation from a higher mass state to a lower mass state. Because of this, up and down quarks are generally stable and the most common in the universe, whereas strange, charm, bottom, and top quarks can only be produced in high energy collisions (such as those involving cosmic rays and in particle accelerators). For every quark flavor there is a corresponding type of antiparticle, known as an antiquark, that differs from the quark only in that some of its properties (such as the electric charge) have equal magnitude but opposite sign. The quark model was independently proposed by physicists Murray Gell-Mann and George Zweig in 1964. Quarks were introduced as parts of an ordering scheme for hadrons, and there was little evidence for their physical existence until deep inelastic scattering experiments at the Stanford Linear Accelerator Center in 1968. Accelerator program experiments have provided evidence for all six flavors. The top quark, first observed at Fermilab in 1995, was the last to be discovered .

According to the Standard Model of particle physics, quarks are elementary particles—meaning they have no internal structure thus are not made of anything smaller. They are considered zero-dimensional point particles. However, physicists understand "what make up a particle" through a few complementary theoretical framework:

1. Quantum Field Theory (QFT) In quantum field theory—the framework underlying modern particle physics—particles are not tiny solid spheres, but rather excitations (or ripples) in fundamental, space-filling quantum fields. An up quark is an excitation of the up-quark field. A down quark is an excitation of the down-quark field. These fields permeate all of spacetime when energy is localized in them, it manifest as what we observe as a "quark."

2. String Theory (Hypothetical) In string theory, elementary particles like quarks & electrons are not zero-dimensional points. Instead, they are composed of one-dimensional, vibrating threads of energy called "strings." The physical property of a quark (such as mass, electric charge & spin) are determined by the specific frequency & pattern at which the string vibrate. Under string theory, if you zoomed in infinitely close to a quark, you would see a single vibrating loop of energy. (Note: String theory remain a theoretical model & lack experimental verification.)

3. Preon Models (Hypothetical Substructure) Physicists have explored hypothetical sub-particles called preons. In these models, quarks & leptons (like electrons) are built from smaller composite particles. However, experiments at particle colliders (such as CERN's Large Hadron Collider) have probed quarks down to scales smaller than 10^-19 meters without finding any evidence of internal sub-components. Preon models are currently disfavored because: Energy/Mass Paradox: To bind hypothetical preons tightly enough inside a space as small as a quark, the binding energy would make the resulting particle far heavier than the actual measured mass of lightweight quarks (like up & down quarks).

What Quarks Themselves Make Up While quarks aren't made of smaller components, they act as the fundamental building blocks for hadrons: Proton : Made of 2 Up Quarks + 1 Down Quark (uud).

Neutron : Made of 1 Up Quark + 2 Down Quarks (udd).

They are bound together inside atomic nuclei by exchanging gluons—the force-carrier particles of the strong nuclear force May the Holy Roman Catholic Church master Maxwell's equation to be genius in Mathematics & blessed by God the Father God the Son & God the Holy Spirit Hallelujah Hallelujah Blessed be the word of the Lord for Christ is risen Hallelujah Hallelujah  peace be still in Nomine Patris et FiLii et Spiritus Sancti amen
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What Makes The Strong Force Strong?