All the matter you see—stars, air, water, your body—is ultimately made of a small set of fundamental particles, which are best understood today as tiny excitations in invisible quantum fields rather than little solid “bits.”

The everyday answer: atoms

At the scale we experience, all ordinary matter is made of atoms.

Atoms are the building blocks of solids, liquids, and gases, and they combine to form molecules like water, oxygen, and DNA.

An atom has three main parts:

  • Protons (positively charged, in the nucleus).
  • Neutrons (neutral, in the nucleus).
  • Electrons (negatively charged, in a cloud around the nucleus).

Different numbers of protons give different chemical elements (hydrogen, carbon, oxygen, iron, etc.), and different arrangements of atoms give all the materials and substances you encounter.

Going deeper: quarks and leptons

If you zoom further in, protons and neutrons are not fundamental.

  • Protons and neutrons are made of quarks (specifically “up” and “down” quarks) held together by the strong nuclear force.
  • Electrons, in contrast, are leptons , which (as far as we know) have no smaller parts.

So for ordinary matter in the universe:

  • The nucleus: made of protons and neutrons → each built from three quarks.
  • The electron cloud: made of electrons, which are fundamental leptons.

Physicists often summarize this as:

Ordinary matter is made of quarks and leptons (plus the forces that bind them).

The current best idea: fields, not little balls

Modern physics goes one step further: particles themselves seem to be ripples in underlying quantum fields , not tiny hard spheres.

  • Each type of particle (electron, quark, photon, etc.) corresponds to a field that fills all space.
  • A “particle” is a localized vibration or excitation in that field.
  • Forces like electromagnetism or the strong force are carried by other particles (photons, gluons) which are themselves field excitations.

So, in today’s best picture:

  • At human scale: matter → molecules.
  • One level down: molecules → atoms.
  • Deeper: atoms → electrons + protons + neutrons.
  • Deeper still: protons and neutrons → quarks; electrons → fundamental leptons.
  • Deepest idea so far: quarks and leptons are quantized excitations of quantum fields spread throughout the universe.

A quick forum-style recap

If you were reading a popular science forum thread titled “what is all matter made of,” the top-voted comment would probably say something like:

“Everything around you is made of atoms, and those atoms are mostly empty space—tiny nuclei of quarks and gluons surrounded by electrons. As far as we can tell, the most fundamental ingredients are quarks and leptons, which aren’t made of anything smaller. Even those aren’t little marbles, but ripples in quantum fields that fill the universe.”

TL;DR:
All matter is made of atoms; atoms are made of electrons plus protons and neutrons; protons and neutrons are made of quarks; and in our best theories, quarks and electrons are fundamental excitations of quantum fields that pervade all of space.

Information gathered from public forums or data available on the internet and portrayed here.