Give the difference between $\psi$ and $|\psi|^2$.

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$\psi$$|\psi|^2$
It is a wave function.It represents the probability density of finding an electron at a point within an atom.
It does not have any direct physical meaning.It has a direct physical meaning.
It is a mathematical function of the coordinates of the electron.$|\psi|^2$ is proportional to the probability of finding an electron,representing electron density.
It can have positive or negative values.It is always positive.
It is used to determine the energy levels of an electron,which are quantized.It is used to determine the distribution and position of electrons,and the shape of orbitals.

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