We learn at school that the atoms that make up the material world are themselves made of subatomic particles - protons, neutrons and electrons.
Quantum Mechanics studies this realm and tells us that these miniscule particles which we normally think of as being solid and occupying a point-like position in space, can also have an non-material existence as an invisible wave of probablity, also called a wave function
There, the subatomic particles evolve as a potential within a wave of probability unless an attempt is made to observe them, whereupon the wave immediately collapses into the solid protons, neutrons and electrons of the real world.
It is not known how or why observation, or the interaction with consciousness, causes the wave function to collapse into reality but the evidence for it is overwhelming.
Each proton, neutron and electron has its own wave function.